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• Performing a fuzzy search may retrieve terms with similar spellings: (( goal robert _. heinemann books ) or ( ((a robert) OR (a robust)) e. heimann books ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( goal robert _. heinemann books ) OR ( ((a robert) OR (a robust)) e. heimann books ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( goal robert _. heinemann books ) or ( ((a robert) OR (a robust)) e. heimann books ))*".