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MATCH (col1,col2,...) AGAINST (expr [search_modifier])

search_modifier: 
{ 
     IN NATURAL LANGUAGE MODE 
   | IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION    
   | IN BOOLEAN MODE 
   | WITH QUERY EXPANSION 
}

Could you please explain me what is QUERY EXPANSION and what do MySQL do with this mode.

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first result in google for 'mysql 5.5 query expansion' dev.mysql.com/doc/refman/5.5/en/fulltext-query-expansion.html – Derek Downey Mar 27 '12 at 16:09
It's similar to the search concept of stemming en.wikipedia.org/wiki/Stemming – atxdba Mar 27 '12 at 16:14

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