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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 croatia deterioration congresses."))) OR ((("underwater archaeology digital preservation 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 croatia deterioration congresses.\"))) or (((\"underwater archaeology digital preservation congresses.\") or (\"underwater archaeology israel representations religieuses.\"))))~".
• Removing quotes may allow a broader search: (((( underwater archaeology critical deterioration congresses. ) OR ( underwater archaeology croatia deterioration congresses. ))) or ((( underwater archaeology digital preservation congresses. ) or ( underwater archaeology israel representations religieuses. ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("underwater archaeology critical deterioration congresses.") OR ("underwater archaeology croatia deterioration congresses."))) or ((("underwater archaeology digital preservation congresses.") or ("underwater archaeology israel representations religieuses."))))*.