Kewl Bar Help  -  Google Help

By default, Google only returns web pages that contain all the words in your query.  You can refine or narrow your search by adding more words to the search terms you have already entered. Your new query will return a smaller subset of the pages Google found for your original query.  To get the best results, be as specific as possible.  If you provide a very specific query, Google has an impressive knack for finding what you are truly looking for.  Google searches are not case sensitive. 

You can include phrases in quotes if necessary.  Since Google returns pages that include all of your search terms by default, there is no need to include "and" between terms.  Google ignores common words and characters such as "where" and "how", as well as certain single digits and single letters, because they tend to slow down your search without improving the results. Google will indicate if a common word has been excluded by displaying details on the results page below the search box.  If a common word is essential to getting the results you want, you can include it by putting a "+" sign in front of it. (Be sure to include a space before the "+" sign.) Another method for doing this is conducting a phrase search, which simply means putting quotation marks around two or more words. Common words in a phrase search (e.g., "where are you") are included in the search.

Also unlike some other search engines, Google does not use "stemming" or support "wildcard" searches. In other words, Google searches for exactly the words that you enter in the search box. Searching for "googl" or "googl*" will not yield "googler" or "googlin". If in doubt, try both forms: "airline" and "airlines," for instance.