Perhaps you should try some spelling variations:
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• If you are trying to use Boolean operators, they must be ALL CAPS: (("underwater archaeology critical deterioration congresses.") OR ((((("underwater archaeology fast preservation congresses.") OR ("underwater archaeology fast restoration congresses."))) OR ("underwater archaeology digital preservation congresses."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("underwater archaeology critical deterioration congresses.") or ((((("underwater archaeology fast preservation congresses.") OR ("underwater archaeology fast restoration congresses."))) or ("underwater archaeology digital preservation congresses."))))*.