Perhaps you should try some spelling variations:
hermann books » german books, hermann brochs, hermann broch
gail robert » hall robert, ball robert, dahl robert
gal robert » hall robert
a robert » 3 robert, dr robert, a robust
heilmann » heilemann, heimann, heitmann
book » ebook
books » 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) OR (gal robert)) e. heilmann book ) or ( a robert _. hermann books ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((gail robert) OR (gal robert)) e. heilmann book ) OR ( a robert _. hermann books )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((gail robert) OR (gal robert)) e. heilmann book ) or ( a robert _. hermann books ))".
• Adding a wildcard symbol may retrieve word variants: (( ((gail robert) OR (gal robert)) e. heilmann book ) or ( a robert _. hermann books ))*.