Perhaps you should try some spelling variations:
goal robert » gal robert, goal poverty
robert j » robert _
a robert » gal robert, a robust
robert e » robert _
book » books
ebook » ebooks
ebookss » ebooksss
eebookss » eebooksss, ebooks
heitmann » heimann, heinemann, hartmann

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