Perhaps you should try some spelling variations:
gail robert » gal robert, davis robert, blair robert
robert e » robert _, robert j
a robust » _ robust
robust e » robust _
book » books, ebook
ebookss » ebooksss, eebookss
eeebooks » eeebookss, eeeebooks, ebooks
heitmann » heimann, heinemann, hartmann

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. hermann book ) or ( a robust e. heitmann (ebookss or eeebooks) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gail robert e. hermann book ) OR ( a robust e. heitmann (ebookss OR eeebooks) )).
• Adding a wildcard symbol may retrieve word variants: (( gail robert e. hermann book ) or ( a robust e. heitmann (ebookss or eeebooks) ))*.