chemical
Finds all documents contain the word "chemical".
oil*
Finds all documents containing one or more words beginning with
the letters 'O' 'I' and 'L'.
"petroleum additive"
Searches for occurances of the exact string of letters "petroleum
additive".
petroleum additive is the same
as petroleum OR additive
Finds documents containing either the word "petroleum" or the word
"additive". Documents containing both will score higher; scoring
higher still if the words appear together.
petroleum AND additive
Finds only documents containing both the words "petroleum" and "additive".
petroleum NOT additive
Looks for documents containg the word "petroleum" while suppressing
documents also containing the word "additive".
oil OR (petroleum AND additive)
Find either documents contain the word "oil", or both of the words
"petroleum" and "additive".
