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You can perform simple searches by just typing in some keywords or more sophisticated searches by using boolean operators (AND, OR, NOT, NEAR), grouping words/phrases using parentheses or quotes. Here are some 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 in close to each 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'