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• Performing a fuzzy search may retrieve terms with similar spellings: (("aftermath of the September 11 attacks") OR ("aftermath of the September 11 attack"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"aftermath of the September 11 attacks\") OR (\"aftermath of the September 11 attack\"))".
• Removing quotes may allow a broader search: (( aftermath of the September 11 attacks ) OR ( aftermath of the September 11 attack )).
• Adding a wildcard symbol may retrieve word variants: (("aftermath of the September 11 attacks") OR ("aftermath of the September 11 attack"))*.