Boolean Search Operators
+	The word is mandatory in all rows returned.	
-	The word cannot appear in any row returned. 	
<	The word that follows has a lower relevance than other words, although rows containing it will still match	
>	The word that follows has a higher relevance than other words. 	
()	Used to group words into subexpressions.	
~	The word following contributes negatively to the relevance of the row (which is different to the '-' operator, which specifically excludes the word, or the '<' operator, which still causes the word to contribute positively to the relevance of the row.	
*	The wildcard, indicating zero or more characters. It can only appear at the end of a word.	
"	Anything enclosed in the double quotes is taken as a whole (so you can match phrases, for example).