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Use AND, OR, NOT and parentheses. Adjacent terms mean AND. Use * for any number of characters and ? for one character.

With Word variants on, a bare Boolean term includes conservative singular and plural forms that exist in the index. Turn it off to match only the typed word form.

Examples: cancer AND NOT lung · (cancer OR tumour) AND immunotherap* · behavio?r

Wildcards need at least two literal characters and may expand to at most 128 indexed terms; narrow any pattern that exceeds the limit. Boolean syntax applies only to keyword search. Quoted exact phrases are not supported yet; semantic search treats the whole query as natural language.