Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
gal robert » hall robert
robert e » robert _, robert j
a robust » _ robust
robust e » robust _, robust a, robust end
heilman » heilmann, hellman, helman
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 e. hermann book ) or ( a robust e. heilman ebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gal robert e. hermann book ) OR ( a robust e. heilman ebooks ))*.