Perhaps you should try some spelling variations:
hermann books » german books, hermann brochs, hermann broch
heimann book » german book
hall robert » cull robert, gal robert, thiel robert
a robert » 3 robert, dr robert, a robust
robert e » robert _, robert j
robert b » robert _, robert j, robert a

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: (( a robert e. hermann books ) OR ( hall robert b. heimann book ))~.
• Adding a wildcard symbol may retrieve word variants: (( a robert e. hermann books ) or ( hall robert b. heimann book ))*.