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• If you are trying to use Boolean operators, they must be ALL CAPS: (( gal robert j. heimann book ) OR ( ((a robert) OR (dr robert)) e. heitmann eebooks ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gal robert j. heimann book ) or ( ((a robert) OR (dr robert)) e. heitmann eebooks ))~".
• Adding a wildcard symbol may retrieve word variants: (( gal robert j. heimann book ) or ( ((a robert) OR (dr robert)) e. heitmann eebooks ))*.