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, hermann, hellman
book » books, ebook
ebooks » ebookss, eebooks
ebookss » ebooksss, eebookss
heimann » hermann

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