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• Performing a fuzzy search may retrieve terms with similar spellings: (germans OR (((gehrmanns OR dermann) OR hermann) OR gehrmann)) empire~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(germans OR (((gehrmanns OR dermann) OR hermann) OR gehrmann)) empire".
• Adding a wildcard symbol may retrieve word variants: (germans OR (((gehrmanns OR dermann) OR hermann) OR gehrmann)) empire*.