Perhaps you should try some spelling variations:
gail robert » gal robert, hall robert, ball robert
robert b » robert _, robert e, robert j
a robust » _ robust
heilmann » heilemann, heitmann, heilman
book » books, ebook
ebookss » ebooksss, eebookss, ebooks
eebookss » eebooksss, eeebookss, eebooks, ebooks

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