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• Performing a fuzzy search may retrieve terms with similar spellings: (( a robust j. heinemann book ) or ( a robert _. hermann eebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( a robust j. heinemann book ) OR ( a robert _. hermann eebooks )).
• Adding a wildcard symbol may retrieve word variants: (( a robust j. heinemann book ) or ( a robert _. hermann eebooks ))*.