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• Performing a fuzzy search may retrieve terms with similar spellings: (( a robust j. heilemann book ) or ( ((hall robert) OR (thiel robert)) j. heilman ebooks ))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( a robust j. heilemann book ) or ( ((hall robert) OR (thiel robert)) j. heilman ebooks ))".
• Adding a wildcard symbol may retrieve word variants: (( a robust j. heilemann book ) or ( ((hall robert) OR (thiel robert)) j. heilman ebooks ))*.