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• Performing a fuzzy search may retrieve terms with similar spellings: (inter OR unter)-american defense (board OR (boar OR boer))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(inter OR unter)-american defense (board OR (boar OR boer))".
• Adding a wildcard symbol may retrieve word variants: (inter OR unter)-american defense (board OR (boar OR boer))*.