Example search queries:

information retrieval -- Finds records containing both "information" and "retrieval".

information AND retrieval -- Same as above.

information OR retrieval -- Finds records containing "information" or "retrieval".

information NEAR retrieval -- Finds records containing both "information" and "retrieval", where the two terms are located close to each other within the document.

"information retrieval" -- Finds records containing the exact phrase "information retrieval". This would not match a document with the phrase "information systems retrieval," for example.

information NOT retrieval -- Finds records containing "information", but not "retrieval".

(information NOT retrieval) AND Web -- Finds records containing "Web" plus "information", but not "retrieval".

Web* -- Finds records containing words starting with "Web". This wild card only works at the end of a word or phrase, for example, "information ret*" or info*, but not "info*tion".