6. BooleanBasics You can narrow you search in order to get effective results by using the following “Commands”. And: It is used when you want to find information which will have the two word you typed. “England and U.S.A” Or: It is used to find either one word or both in the searching. “English or German”. And not: It is used when you want to find a document which has one word, but not if the document also contains another word.
7. Quick Tips Use nouns,pronouns, and conjuctions, never use articles “the”. Use from 6 to 8 words per search. When you will use, or combine word into phrases, place them inside quotation marks. Spell carefully. Avoid redundant terms.
8. You can find more information : http://www.media-awareness.ca/english/index.cfm