Perhaps you should try some spelling variations:
goal robert » gal robert, goal poverty
robert j » robert _
robust e » robust _
robert e » robert _
heitmann » heimann, heinemann, hermann
book » books, ebook
ebooks » ebookss, eebooks, books, ebook
heilmann » heimann, heinemann, hermann

You may be able to get more results by adjusting your search query.

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