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• Performing a fuzzy search may retrieve terms with similar spellings: (( 1920 german federal election ) OR ( 1920 germans federale lektion ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 1920 german federal election ) OR ( 1920 germans federale lektion ))".
• Adding a wildcard symbol may retrieve word variants: (( 1920 german federal election ) OR ( 1920 germans federale lektion ))*.