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