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• Performing a fuzzy search may retrieve terms with similar spellings: (( gal robert e. heinemann book ) or ( a robust _. (heilman OR heilmann) eebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gal robert e. heinemann book ) OR ( a robust _. (heilman OR heilmann) eebooks )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gal robert e. heinemann book ) or ( a robust _. (heilman OR heilmann) eebooks ))".
• Adding a wildcard symbol may retrieve word variants: (( gal robert e. heinemann book ) or ( a robust _. (heilman OR heilmann) eebooks ))*.