Perhaps you should try some spelling variations:
goal robert » gal robert, goal poverty
robert j » robert _, robert e
a robust » _ robust
robust e » robust _, robert e
book » books, ebook
ebooks » ebookss, eebooks
eebooks » eebookss, eeebooks
heilman » heilmann, hellman, heitmann

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 ( a robust e. heilman (ebooks or eebooks) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( goal robert j. hermann book ) OR ( a robust e. heilman (ebooks OR eebooks) )).
• Adding a wildcard symbol may retrieve word variants: (( goal robert j. hermann book ) or ( a robust e. heilman (ebooks or eebooks) ))*.