Stemming

Поисковик Google - не понимает морфологию русского языка вообще. Для английского языка есть Stemming: Google now uses stemming technology. Thus, when appropriate, it will search not only for your search terms, but also for words that are similar to some or all of those terms. If you search for pet lemur dietary needs, Google will also search for pet lemur diet needs, and other related variations of your terms. Any variants of your terms that were searched for will be highlightedin the snippet of text accompanying each result.

http://www.google.com/help/basics.html

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