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Google Help: Advanced Search (within Google)Expressions used in searching
[" "] this is used to denote a phrase expression or search. All the words in the [" "] must be found at a web site to produce a hit.[OR] a or b will find either the "a" keyword or the "b" keyword[AND] a AND b must find both "a" and "b" at a web site to produce a hit[( )] these are used to organize a complex search expression. One of the more flexible search options available at most search engines is the "*" operator or wild card operator. This allows queries to contain incomplete words, however, this kind of query will probably yield a considerable number of unnecessary hits.
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