This search form looks phrases in the Online Documentation. The search is not case sensitive. For example:

information retrieval
finds documents containing 'information retrieval'

information or retrieval
finds documents containing 'information' or 'retrieval' (specify only two conditions)

information and retrieval
finds documents containing both 'information' and 'retrieval' (specify only two conditions)

information and !(retrieval)
finds documents containing 'information' but not 'retrieval' (specify only two conditions)

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