Perhaps you should try some spelling variations:
hermann books » hermann brochs, hermann broch, demand books
german books » german book, german food
gal robert » hall robert
robert a » robert _, robert j
a robert » 3 robert, dr robert, a robust
robert e » robert _, robert j
book » ebook
books » ebooks

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 a. heinemann book ) OR ( a robert e. ((hermann books) OR (german books)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gal robert a. heinemann book ) or ( a robert e. ((hermann books) OR (german books)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( gal robert a. heinemann book ) or ( a robert e. ((hermann books) OR (german books)) ))*.