General Encyclopedia


Containing nearly 51,000 entries (marshalling six and one-half million words on a vast range of topics), and with more than 80,000 hypertext cross-references,
CONTENTS
Alphabetic Index of Entries
This browsable alphabetic index comprises over 51,000 entries.
   A   to   Brewster, Sir David
   Brewster, Kingman, Jr.   to   Doesburg, Theo van
   dog   to   Hanno, Carthaginian statesman
   Hanno, city, Japan   to   Léros
   Lerroux, Alejandro   to   Odo
   Odoacer   to   Salisbury Plain
   Salish   to   universals
   universal time   to   Zyuganov, Gennady

Index to Biographical Entries
A listing of entries grouped by hundreds of separate categories.

List of online encyclopedias

 


Advanced Searching Techniques

Advanced Searching Techniques

Web Search Tutorial - 11 Advanced Searching Tips

Most of the time, you'll find exactly what you're looking for with just a basic query (the word or phrase you search for). However, the following tips can help you make the most of your searches. Throughout the article, we'll use square brackets [ ] to signal a search query, so [ black and white ] is one query, while [ black ] and [ white ] are two separate queries.


Voice Search is available on Google.com using Google Chrome. Learn more about Voice Search.

Some basic facts
•Every word matters. Generally, all the words you put in the query will be used.
•Search is always case insensitive. A search for [ new york times ] is the same as a search for [ New York Times ].
•Generally, punctuation is ignored, including @#$%^&*()=+[]\ and other special characters.

To make sure that your Google searches return the most relevant results, there are some exceptions to the rules above.
Tips for better searches
•Keep it simple. If you're looking for a particular company, just enter its name, or as much of its name as you can recall. If you're looking for a particular concept, place, or product, start with its name. If you're looking for a pizza restaurant, just enter pizza and the name of your town or your zip code. Most queries do not require advanced operators or unusual syntax. Simple is good.


•Think how the page you are looking for will be written. A search engine is not a human, it is a program that matches the words you give to pages on the web. Use the words that are most likely to appear on the page. For example, instead of saying [ my head hurts ], say [ headache ], because that's the term a medical page will use. The query [ in what country are bats considered an omen of good luck? ] is very clear to a person, but the document that gives the answer may not have those words. Instead, use the query [ bats are considered good luck in ] or even just [ bats good luck ], because that is probably what the right page will say.


•Describe what you need with as few terms as possible. The goal of each word in a query is to focus it further. Since all words are used, each additional word limits the results. If you limit too much, you will miss a lot of useful information. The main advantage to starting with fewer keywords is that, if you don't get what you need, the results will likely give you a good indication of what additional words are needed to refine your results on the next search. For example, [ weather cancun ] is a simple way to find the weather and it is likely to give better results than the longer [ weather report for cancun mexico ].


•Choose descriptive words. The more unique the word is the more likely you are to get relevant results. Words that are not very descriptive, like 'document,' 'website,' 'company,' or 'info,' are usually not needed. Keep in mind, however, that even if the word has the correct meaning but it is not the one most people use, it may not match the pages you need. For example, [ celebrity ringtones ] is more descriptive and specific than [ celebrity sounds ].
As always, we use square brackets [ ] to denote queries, so [ to be or not to be ] is an example of a query; [ to be ] or [ not to be ] are two examples of queries.

•Phrase search ("")
By putting double quotes around a set of words, you are telling Google to consider the exact words in that exact order without any change. Google already uses the order and the fact that the words are together as a very strong signal and will stray from it only for a good reason, so quotes are usually unnecessary. By insisting on phrase search you might be missing good results accidentally. For example, a search for [ "Alexander Bell" ] (with quotes) will miss the pages that refer to Alexander G. Bell.
•Search within a specific website (site:)
Google allows you to specify that your search results must come from a given website. For example, the query [ iraq site:nytimes.com ] will return pages about Iraq but only from nytimes.com. The simpler queries [ iraq nytimes.com ] or [ iraq New York Times ] will usually be just as good, though they might return results from other sites that mention the New York Times. You can also specify a whole class of sites, for example [ iraq site:.gov ] will return results only from a .gov domain and [ iraq site:.iq ] will return results only from Iraqi sites.
•Terms you want to exclude (-)
Attaching a minus sign immediately before a word indicates that you do not want pages that contain this word to appear in your results. The minus sign should appear immediately before the word and should be preceded with a space. For example, in the query [ anti-virus software ], the minus sign is used as a hyphen and will not be interpreted as an exclusion symbol; whereas the query [ anti-virus -software ] will search for the words 'anti-virus' but exclude references to software. You can exclude as many words as you want by using the - sign in front of all of them, for example [ jaguar -cars -football -os ]. The - sign can be used to exclude more than just words. For example, place a hyphen before the 'site:' operator (without a space) to exclude a specific site from your search results.
•Fill in the blanks (*)
The *, or wildcard, is a little-known feature that can be very powerful. If you include * within a query, it tells Google to try to treat the star as a placeholder for any unknown term(s) and then find the best matches. For example, the search [ Google * ] will give you results about many of Google's products (go to next page and next page -- we have many products). The query [ Obama voted * on the * bill ] will give you stories about different votes on different bills. Note that the * operator works only on whole words, not parts of words.
•Search exactly as is (+)
Google employs synonyms automatically, so that it finds pages that mention, for example, childcare for the query [ child care ] (with a space), or California history for the query [ ca history ]. But sometimes Google helps out a little too much and gives you a synonym when you don't really want it. By attaching a + immediately before a word (remember, don't add a space after the +), you are telling Google to match that word precisely as you typed it. Putting double quotes around a single word will do the same thing.
•The OR operator
Google's default behavior is to consider all the words in a search. If you want to specifically allow either one of several words, you can use the OR operator (note that you have to type 'OR' in ALL CAPS). For example, [ San Francisco Giants 2004 OR 2005 ] will give you results about either one of these years, whereas [ San Francisco Giants 2004 2005 ] (without the OR) will show pages that include both years on the same page. The symbol | can be substituted for OR. (The AND operator, by the way, is the default, so it is not needed.)
Learn about a few special search features to help you find exactly what you're looking for as quickly as possible.
Exceptions
Search is rarely absolute. Search engines use a variety of techniques to imitate how people think and to approximate their behavior. As a result, most rules have exceptions. For example, the query [ for better or for worse ] will not be interpreted by Google as an OR query, but as a phrase that matches a (very popular) comic strip. Google will show calculator results for the query [ 34 * 87 ] rather than use the 'Fill in the blanks' operator. Both cases follow the obvious intent of the query. Here is a list of exceptions to some of the rules and guidelines that were mentioned in this and the Basic Search Help article:

Exceptions to 'Every word matters'
•Words that are commonly used, like 'the,' 'a,' and 'for,' are usually ignored (these are called stop words). But there are even exceptions to this exception. The search [ the who ] likely refers to the band; the query [ who ] probably refers to the World Health Organization -- Google will not ignore the word 'the' in the first query.
•Synonyms might replace some words in your original query. (Adding + before a word disables synonyms.)
•A particular word might not appear on a page in your results if there is sufficient other evidence that the page is relevant. The evidence might come from language analysis that Google has done or many other sources. For example, the query [ overhead view of the bellagio pool ] will give you nice overhead pictures from pages that do not include the word 'overhead.'
Punctuation that is not ignored
•Punctuation in popular terms that have particular meanings, like [ C++ ] or [ C# ] (both are names of programming languages), are not ignored.
•The dollar sign ($) is used to indicate prices. [ nikon 400 ] and [ nikon $400 ] will give different results.
•The hyphen - is sometimes used as a signal that the two words around it are very strongly connected. (Unless there is no space after the - and a space before it, in which case it is a negative sign.)
•The underscore symbol _ is not ignored when it connects two words, e.g. [ quick_sort ].
 

If you want to filter and customize the search results you see, use the options along the side of the results page. For example, you can choose to just see blogs updated within the last 24 hours or photos of a certain size.

How to use search options and tools

  1. On the side of your search results page, click a filtering option to customize the search results page you're looking at.

     
    We'll automatically show you the tools and filtering options that are most relevant to your search.

    To see more, click More and More search tools to see all the available filters and views you can apply to that search. Since your options will vary based on the search and the filters you've already used, you won't see all the options all the time.
     
  2. Try clicking on two or more options to form a more complex, more focused filter.
     
  3. To go back to standard unfiltered Google results, click Reset tools at the bottom of the panel.

Filter results by type of content

The top group of options will filter results by the type of web content you'll see.
  • Everything: By default, your Google search will show unfiltered results that can include all the types of content below.
  • Images: See only results from Google Images.
  • News: See only results from Google News.
  • Books: See only results from Google Books including reviews, excerpts, and where you can buy the book.
  • Videos: See only video results using Google's Video Search.
  • Blogs: See only results from Google Blog Search.
  • Places: See only results from Google Place Pages.
  • Shopping: See only results from Google Product Search. (With this option, you'll see results within the Product Search site rather than in a Google search results page.)
  • Discussions: See what people are saying in discussion groups, forums, and question-and-answer sites.
  • Recipes: See only results for recipes. Customize and filter these results to show recipes with your ideal ingredients, cook time and calorie count. This feature is currently not available in all languages. Learn more about Recipe View

You won't always see all of these options, so click More below your list to see all the available types for that particular search.

Customize your results by location

The location used to customize your results is clearly indicated on the left side of your results page. Our location detection technology will automatically set a location for you, but you can easily specify an alternate location.

Filter results by other criteria

Based on your search and the Google property you've selected, you'll see a customized list of filtering tools. We'll automatically show you the tools that seem most relevant to your search, so you won't always see all of these tools. Here are a few tools that you might see:

Publish date

Limit results according to when they were published on the Web. Google tries to estimate the publication date for a page by using information such as the date when Google first indexed the page. See the options
  • Any time: By default, your search results will not be filtered by date.
     
  • Latest: Sometimes the top results that show up are a little dated, although they're still relevant. The Latest option shows you results that are both relevant and fresh. Google automatically optimizes the time period used for your filter to make sure that the most relevant and recent results are included. (This option is only available when Everything is selected in the first group of options.)
     
  • Past 24 hours / Past week / Past month / Past year: Use these pre-defined ranges of times to find webpages. For instance, the Past 24 hours option will help you find information about current events.
     
  • Custom range: This option lets you define your own date range. Enter the dates you want to use in the format mm/dd/yyyy, then click Search. This option works best for pages published after 2001; to find historical mentions of dates, try using the Timeline tool.

Personalization

Limit the results to content that is more personalized to you. For example, see content from your friends (Social) or content from a geographical area (Nearby). See the options
  • Social: If you're signed in to Google, see only social search results. You'll see publicly-accessible content from people in your social circle that is relevant to your search. The idea is that content from your friends and social contacts is often more relevant to you than content from strangers.
     
  • Nearby: Only see results that might be especially relevant for your preferred location indicated on the side of your results page. You can easily specify your preferred location.
     
  • Web History: Limit the results to pages you have or have not already visited. If you're signed in to your Google Account and have Web History enabled, you can use this tool to restrict your results to pages you either have, or haven't, visited in the past while Web History was enabled.
    • Want to find something new? Try Not yet visited.
    • Need to remember a helpful site from last month? Visited pages will focus your search.

Display options

This section lets you change the way results are displayed. The default Standard view shows you regular Google results, where each result is composed of the page title and a few lines of text (also known as the "snippet").See the options
  • Sites with images: See image thumbnails from the page alongside the snippet for each result. They can help you quickly identify whether the page is relevant to your search term. For example, if you see an image of a furry little critter when you search for [ mouse ], you can probably deduce that the page isn't talking about computer equipment.
     
  • Translated foreign pages: Sometimes, the best results for your search are written in another language. Based on your search term, Translated foreign pages automatically chooses the best language (or languages) to search in, translates your search, and then translates the results back to the language you prefer to read. Our automatic language selection isn't perfect, of course, so if you'd like to search specific languages, select them in the panel above the results.
     
  • Timeline: See results along a timeline, which is especially useful if you're researching information about a historical person or event. Click any section in the timeline to zoom in on that time period. To change the time range, click Search other dates above the timeline to enter new start and end dates. Alternatively, click the date links below the timeline to see results that mention that particular year, month, or day.
     
  • Reading level: You can limit your search results to a specific reading level (Basic, Intermediate, or Advanced). Learn more about the Reading level tool.

Content type options

When you select a specific type of content like Videos or Images, you'll often see a set of tools that are unique to that selection. For example, if you select Images, you can filter image results by size, type, and color. Learn more about the search tools specific to Google Images.

See definitions for your search term using Dictionary. You can also find synonyms, images, usage examples, and learn if the term is a word in other languages.

Discover more results

If you're ever unsure about the precise terms you should use for your search, start out with a broader search term, then use these tools to discover alternative search terms. The Something different option lets you find parallel searches that you might find interesting.


Top 50 Search Engines
 

  • Google - Google UK - Google Image Search
    Google is a search engine that makes heavy use of link popularity as a primary way to rank web sites. Users across the web have in essence voted for good sites by linking to them.
     
  • Ask Jeeves - Jeeves For Kids - Ask Jeeves UK
    Innovative online search service that processes plain-language queries with surprising accuracy.
     
  • Lycos - Lycos UK
    Lycos has been around since the early days of the net and is still one of the most popular search engines. The service employs human editors for some of its listings, complemented by crawler-based results. The name Lycos comes from the Latin for "wolf spider."
     
  •  Alta Vista - Alta Vista UK -
    An awesome site from Digital, it maintains a HUGE index with powerful and FAST search functions. Coverage is excellent so it is good for broad searching and for offbeat subjects but you can be overwhelmed by too many hits. The Advanced Search is useful for finding images, MP3/audio and video files, and there's the useful Babelfish Translator .
     
  • LookSmart - Looksmart UK
    LookSmart is the closest rival Yahoo has, in terms of being a human-compiled directory of the web. The high quality of the directory is thanks to a team of nearly 200 full-time professional editors.
     
  • Yahoo! - Yahoo UK
    Yahoo is the web's most popular search service and has a well-deserved reputation for helping people find information easily. The secret to Yahoo's success is human beings. It is the largest human-compiled guide to the web, employing 80 or more editors in an effort to categorize the web. Yahoo has at least 1 million sites listed.
  • MSN (Microsoft)
    Microsoft's MSN service features both directory listings and search engine results. Powered by Inktomi, this is now one of the most powerful search engines.
  • BBC - Search The Web
    The BBC's "family friendly" search engine, based on Google search technology. Results are clear, uncluttered, relevant, and commercial free. "Our results are the ones that best match your search words - not the ones advertisers want you to see." Excellent!
     
  • GigaBlast
    Gigablast is a new search-engine that looks set to challenge Google. It's been set up by a New Mexican Software Engineer, and already producing great search results.
     
  • GO Network
    Go is the reincarnation of Infoseek, a newly designed site claiming to have enhanced capabilities, with a 50% larger search index and search results pages that are 30% faster. It offers portal features such as personalization and free e-mail.
     
  • HotBot
    This search engine has a great many loyal fans. It very often comes up with the goods where other engines fail.
     
  • Open Directory
    NetScape's Open Directory Project aims to build the most comprehensive human-reviewed directory of the web, by relying on a vast army of volunteer editors.
     
  • Teoma Search
    Teoma, which means "expert" in Gaelic, determines the authority or quality of a site's content, by using Subject-Specific Popularity. Subject-Specific Popularity ranks a site based on the number of same-subject pages that reference it, not just general popularity.
     
  • FAST Search
    One of the new generation of search services, armed with next-generation technology. FAST aims to be bigger, speedier and more accurate than the existing major search engines.
     
  • Multi Search
    Multi Search is a powerful tool which will search all the top search engines with one click.
     
  • Webcrawler
    One of the first and biggest search engines, and it still produces highly relevant results.
  • REX
    This is a VERY nice site - a little sense of humour, very professionally done.
  • HandiLinks
    This is a great directory. HandiLinks listings are all organized into a hierarchical index and it's fast and easy-to-use. It has extensive categorization, and uses a frame design that aids rather than getting in the way of searches.
  • Snap.com
    Snap.com is a human-compiled directory of web sites, supplemented by search results. It aims to challenge Yahoo as the champion of categorizing the web.
  • Scour.Net
    A useful multimedia search engine. Use it to find audio, video, images and animation Scour.Net takes you directly to the multimedia you are searching for, quickly and easily.
  • AAA Matilda
    The most popular search engine outside of North America. Matilda is a very individual search engine from Australia, and growing rapidly in popularity.
  • UK Plus
    UK Plus features reviews of UK-relevant sites, prepared by a team of journalists. Reviews are grouped into various channels, covering everything from Arts and Business to Travel and Work. They are also searchable.
  • Direct Hit
    This Popularity Engine tracks the sites that people actually select from the search results list. By analyzing the activity of millions of previous Internet searchers, Direct Hit determines the most popular and relevant sites for your search request.
  • Dogpile
    Sends a search to a customizable list of search engines, directories and specialty search sites.
  • Britannica Internet Guide
    This site strives to list only the highest quality sites on the Net. It's now integrated into the Britannicca.com website, so you get a high-quality search engine and encyclopaedia at the same time.
  • Go2Net
    This is a metacrawler, in other words it searches several other search engines in order to obtain its results. Rapidly gaining in popularity as a web portal.
  • Alba36.com
    A human reviewed searchable directory to over 2700 specialty and regional search engines, vortals, portals, topical guides, specialized directories and the best web sites.
     
  • WhosBest.com
    A search engine that gives ratings for each site.
  • ANZWERS
    ANZWERS (Australian and New Zealand Web Enquiry and Research System) offers visitors the ability to quickly conduct region and domain specific searches.
  • Mamma
    Sends search requests to seven major search engines.
  • NewsTrawler
    Allows you to send a query to one or more news sites from one location. Hundreds of sites are listed, by country and by category.
  • EuroSeek
    EuroSeek is distinguished from other such engines by a multi-lingual interface.
  • Your WebScout
    A popular index of the Net's best Web sites, discussion groups and archives.
  • Northern Light
    A professional researchers' favourite, because it organises material so well by topic. Based in Canada.
  • SelectSurf
    An excellent website directory, that doesn't overwhelm with too many sites.
  • BrightGate MetaSearch
    Searches over 20 search engines using a parallel metasearch.
     
  • NewsBot
    HotBot's news-only search service.
  • UKMax
    UKMax allows users to search only pages within the .uk domain or perform a worldwide search. It also offers some directory listings, regional news content, weather reports, and portal features such as portfolio tracking.
  • SearchUK
    Lists UK-related domains.
  • Global Online Directory (GOD)
    UK based search engine.
  • GoTo
    GoTo is the only major search engine which sells listings. Companies can pay money to be placed higher in the search results, which GoTo feels improves relevancy.
  • Internet Sleuth
    Allows you to search the standard search engine choices or a huge number of specialty sites, all from the same place.
  • Search Spaniel
    This dog sniffs out several of major search engines at the same time, or you can choose to do the same with an extensive list of specialty search services, such as for entertainment or employment information.
  • SavvySearch
    Metacrawler type engine.
  • BOTBOT.com
    BOTBOT parallel search engine and Web Directory - Get multiple results using advanced parallel search technology. Search the Web, News, MP3, Images, Audio, Video and more. Comes up with some good results.
     
  • UK Index
    Lists sites based in the UK or that are UK-relevant.
  • Metafind
    Similar to Dogpile, except that searches only go to search engines.
  • HuskySearch
    The author of MetaCrawler continues research into information retrieval with this University of Washington-based metacrawler.
  • Mirago
    UK directory and search engine.
  • HealthLinks
    Massive directory listing over 4,600 health related websites in 150 categories.

    Other Search Engine related sites:

    Excite Search Voyeur
    See what other users are searching for on the Excite search engine. Updates every few seconds, and you can click on each query to see the results.
    McKinley Search Voyeur
    Similar to the Excite Search Voyeur.
    Search Engine Watch
    Contains listings of general-purpose search engines, meta search engines and specialty search engines, along with detailed searching tips, a newsletter, and reviews and tests to keep you up to date with what is hot and what is not.
    Traffick
    This Guide to Portals offers regular coverage of the major web portals: Comparison chart, feature reviews, regular analysis, and daily web portal news.
    What-U-Seek
    With What-U-Seek you can add a professional-level search engine to your web site in five minutes or less.
     

    Other Search Engines:

    PureSearch
    Enter a query, select a search engine from those listed, and results pop up in a new window.
    ProFusion
    University of Kansas metacrawler that allows searches of up to six major search engines and also provides broken link detection.
    Inference Find
    InFind is "The Intelligent Massively Fast Parallel Web Search", which will search all the major search engines in the blink of an eyelid, then categorize the results under useful headings. Excellent!