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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 critical edition congresses."))) OR ("underwater archaeology egypt restoration congresses."))~.
• 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 critical edition congresses.\"))) or (\"underwater archaeology egypt restoration congresses.\"))~".
• Removing quotes may allow a broader search: (((((( underwater archaeology critical deterioration congresses. ) OR ( underwater archaeology croatia deterioration congresses. ))) or ( underwater archaeology critical edition congresses. ))) or ( underwater archaeology egypt restoration congresses. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("underwater archaeology critical deterioration congresses.") OR ("underwater archaeology croatia deterioration congresses."))) or ("underwater archaeology critical edition congresses."))) or ("underwater archaeology egypt restoration congresses."))*.