Perhaps you should try some spelling variations:
gal robert » hall robert
robert j » robert _
a robert » 3 robert, dr robert, a robust
robert e » robert _
book » books, ebook
ebookss » ebooksss, eebookss
eebooks » eebookss, eeebooks
ebooks » ebookss, eebooks
heilmann » heilemann, heimann, heilman

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( gal robert j. heitmann book ) or ( a robert e. heilmann (ebookss or (eebooks or ebooks)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gal robert j. heitmann book ) OR ( a robert e. heilmann (ebookss OR (eebooks OR ebooks)) )).
• Adding a wildcard symbol may retrieve word variants: (( gal robert j. heitmann book ) or ( a robert e. heilmann (ebookss or (eebooks or ebooks)) ))*.