Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann von
hermann lohr » hermann der, hermann von
gal robert » hall robert
robust end » robust read, robust bound
robert j » robert _, robert e
_ robust » _ robert
heilman » heilmann, hellman, helman
ebooks » books, ebook, redbooks

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 j. ((hermann book) OR (hermann lohr)) ) OR ( _ robust end. heilman ebooks ))~.
• Adding a wildcard symbol may retrieve word variants: (( gal robert j. ((hermann book) or (hermann lohr)) ) or ( _ robust end. heilman ebooks ))*.