use * to substitute for zero or more letters (e.g.: "fish*" finds fish, fishes, fishing, etc.)
use # to find variant spellings (e.g.: "arch#eology" finds archaeology and archeology)
you may use AND or OR in your search
(e.g.: "(heart OR cardiac) AND surgery"
finds all records having either heart or cardiac in them, together with surgery)
searches are not case sensitive
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