Perhaps you should try some spelling variations:
hermann books » hermann brochs, hermann broch, demand books
german books » german book, german food
hall robert » cull robert, gal robert, thiel robert
a robert » 3 robert, dr robert, a robust
robert e » robert j
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: (( hall robert _. heilmann book ) or ( a robert e. ((hermann books) OR (german books)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( hall robert _. heilmann book ) OR ( a robert e. ((hermann books) OR (german books)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( hall robert _. heilmann book ) or ( a robert e. ((hermann books) OR (german books)) ))*".