Perhaps you should try some spelling variations:
gail robert » gal robert, hall robert, ball robert
robert e » robert _, robert j
a robert » 3 robert, dr robert, a robot
a robust » _ robust
heilmann » heilemann, heimann, heilman
book » books, ebook
ebooks » ebookss, eebooks, books, ebook, redbooks
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. heilmann book ) or ( ((a robert) or (a robust)) _. heitmann ebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gail robert e. heilmann book ) OR ( ((a robert) OR (a robust)) _. heitmann ebooks )).
• Adding a wildcard symbol may retrieve word variants: (( gail robert e. heilmann book ) or ( ((a robert) or (a robust)) _. heitmann ebooks ))*.