For effective searching use fulltext operators to specify your query:
+ : a leading plus sign indicates that this word must be present in every row returned.
- : a leading minus sign indicates that this word must not be present in any row returned.
< > : these two operators are used to change a word's contribution to the relevance value that is assigned to a row. The < operator decreases the contribution and the > operator increases it.
( ) : 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 row relevance to be negative. It's useful for marking noise words. A row that contains 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.
" : double quotes at the beginning and end of a phrase, matches only rows that contain the complete phrase, as it was typed.