Boolean searchesuse the words AND, OR, AND NOT to help locate a search term. AND - search results must contain all words joined by AND. ex: Sterling AND Gas OR - search results must contain at least one of the words. ex: Sterling OR Gas AND NOT - search results can not contain a word after the term AND NOT. ex: Sterling AND NOT Gas. Groups words to be searched when using multiple Boolean terms. ex: Sterling AND (Gas OR Savings).
 

Other search hints:

Using a "+" sign between words will force the search to find all the words. ex: Sterling+Gas. To find a phrase, i.e. words in exact sequence, enclose the words between double quotes, as in "Palo Alto". If your query is vague and returns too many results, try to categorize the results through the refine button. Tip: To force a word to appear in a document, add a plus sign in front of it: eclipse + moon To find a phrase, i.e. words in exact sequence, enclose the words between double quotes, as in "Palo Alto". To exclude a word, add a minus sign directly in front of it: eclipse -sun