For example, the search vikings not minnesota would retrieve records about Vikings but not the Minnesota Vikings. If you are doing a history paper about Medieval Viking sagas, this is probably a good thing. If you are writing about pro football, it's not. Then we used Boolean AND to combine these words with rainforests . The parentheses ensure that results are what we expect.
Parentheses indicate relationships between search terms.
They force the computer to process your search terms in the order you intend and to combine them in the way you want. Read more about computer search order below. Anything enclosed in parentheses is evaluated first. It will improve search results and save you time. NOT eliminates all catalog records that contain the term preceded by NOT , but it is a useful tool when a search word has several unrelated meanings.