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

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

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