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  Boolean Operators  
 
Operator
Meaning
By default (when neither plus nor minus is specified) the word is optional, but the entries that contain it will be rated higher.
 
        +
 A leading plus sign indicates that this word must be present in every entry returned.
 
        -
 A leading minus sign indicates that this word must not be present in any entry returned.
 
        " "
 Double quotes at the beginning and end of a phrase, matches only content that contains the complete phrase, as it was typed.
 
        < >
 These two operators are used to change a word's contribution to the relevance value that is assigned to an entry. The < operator decreases the contribution and the > operator increases it. See the example below.
 
        ( )
 Parentheses are put round sub-expressions to give them higher precedence in the search.
 
        ~
 A leading tilde acts as a negation operator, causing the word's contribution to the entry's relevance to be negative. It's useful for marking noise words. Entries that contain such a word will be rated lower than others, but will not be excluded altogether, as it would be with the minus operator.
 
        *
 An asterisk is the truncation operator. Unlike the other operators, it is appended to the word, or fragment, not prepended.
Examples
 
apple banana Find entries that contain at least one of the two words.
 
+apple +juice Find entries that contain both words.
 
+apple macintosh Find entries that contain the word "apple", but rank entries higher if they also contain "macintosh".
 
+apple -macintosh Find entries that contain the word "apple" but not "macintosh".
 
+apple +(›turnover ‹strudel) Find entries that contain the words "apple" and "turnover", or "apple" and "strudel" (in any order), but rank "apple turnover" higher than "apple strudel".
apple* Find entries that contain words such as "apple", "apples", "applesauce", or "applet".
 
"some words" Find entries that contain the exact phrase "some words" (for example, entries that contain "some words of wisdom" but not "some noise words"). Note that the '"' characters that surround the phrase are operator characters that delimit the phrase. They are not the quotes that surround the search string itself.