AND narrows your search. This operator is used to increase the number of records retrieved. OR broadens your search. NOT narrows your search. Read more about positional operators .
Truncation Use a truncation symbol to find variant forms of a search term.
Must be used at the end of a word. You may specify the number of characters you want the computer to find. Can be used in the middle or at the end of a word. Nesting is the use of parenthesis to put your search terms into sets.