Perhaps you should try some spelling variations:
german book » german books, german food
gal robert » hall robert
a robust » _ robust
robust e » robust _, robust a, robust end
heilman » heilmann, hellman, helman
eebookss » ebooks, eebooks, ebookss, redbookss, texbookss
ebookss » ebooks
eebooks » ebooks, redbooks, texbooks

You may be able to get more results by adjusting your search query.

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