Search :

The text search engine allows queries to be formed from arbitrary Boolean expressions containing the keywords AND, OR, and NOT, and grouped with parentheses. For example:

information retrieval      finds documents containing 'information' or 'retrieval'
information or retrieval   same as above

information and retrieval  finds documents containing both 'information' and 'retrieval'

information not retrieval  finds documents containing 'information' but not 'retrieval'

(information not retrieval) and WAIS finds documents containing 'WAIS', plus 'information' but not 'retrieval'

web* finds documents containing words starting with 'web'

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