может, поэтому:
rtfmAs of Version 4.1.1, full-text search supports query expansion (in particular, its variant ``blind query expansion''). It is generally useful when a search phrase is too short, which often means that the user is relying on implied knowledge that the full-text search engine usually lacks. For example, a user searching for ``database'' may really mean that ``MySQL'', ``Oracle'', ``DB2'', and ``RDBMS'' all are phrases that should match ``databases'' and should be returned, too. This is implied knowledge. Blind query expansion (also known as automatic relevance feedback) works by performing the search twice, where the search phrase for the second search is the original search phrase concatenated with the few top found documents from the first search. Thus, if one of these documents contained the word ``databases'' and the word ``MySQL'', then the second search will find the documents that contain the word ``MySQL'' but not ``database''
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да пребудет с вами гугл!