For example, the search vikings not minnesota retrieves records about Vikings but not the Minnesota Vikings. If you are studying Medieval Viking sagas, this is good. If you are researching 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.