Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
gal robert » hall robert
robert j » robert _
a robert » 3 robert, dr robert, a robust
robert e » robert _
heilmann » heilemann, heimann, heitmann
ebooks » books, ebook, redbooks

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( gal robert j. hermann book ) OR ( a robert e. heilmann ebooks ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gal robert j. hermann book ) OR ( a robert e. heilmann ebooks ))".
• Adding a wildcard symbol may retrieve word variants: (( gal robert j. hermann book ) OR ( a robert e. heilmann ebooks ))*.