Perhaps you should try some spelling variations:
gail robert » gal robert, davis robert, blair robert
robert e » robert j
a robert » gal robert, a robust
heilmann » heitmann, heinemann, hellman
book » books, ebook
ebooks » ebookss, eebooks
eebooks » eebookss, eeebooks
heimann » heinemann

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

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