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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 digital preservation congresses.") OR ("underwater archaeology digital restoration congresses."))) OR ("underwater archaeology israel representations religieuses."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"underwater archaeology critical deterioration congresses.\") or (((((\"underwater archaeology digital preservation congresses.\") OR (\"underwater archaeology digital restoration congresses.\"))) or (\"underwater archaeology israel representations religieuses.\"))))~".
• Removing quotes may allow a broader search: (( underwater archaeology critical deterioration congresses. ) or ((((( underwater archaeology digital preservation congresses. ) OR ( underwater archaeology digital restoration congresses. ))) or ( underwater archaeology israel representations religieuses. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("underwater archaeology critical deterioration congresses.") or ((((("underwater archaeology digital preservation congresses.") OR ("underwater archaeology digital restoration congresses."))) or ("underwater archaeology israel representations religieuses."))))*.