Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
gal robert » hall robert
a robert » 3 robert, dr robert, a robust
robert a » robert _, robert e
robert j » robert _, robert e
ebooksss » ebooks
ebookssss » ebookss

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 a. hermann book ) OR ( gal robert j. heinemann (ebooksss OR ebookssss) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( a robert a. hermann book ) or ( gal robert j. heinemann (ebooksss OR ebookssss) ))~".
• Adding a wildcard symbol may retrieve word variants: (( a robert a. hermann book ) or ( gal robert j. heinemann (ebooksss OR ebookssss) ))*.