Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
a robust » _ robust
robust j » robust _, robust a, robust job
a robert » 3 robert, dr robert, a robot
robert e » robert _, robert j
eebookss » ebooks
eeebookss » eebooks

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 robust j. hermann book ) OR ( a robert e. heimann (eebookss OR eeebookss) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( a robust j. hermann book ) or ( a robert e. heimann (eebookss OR eeebookss) ))~".
• Adding a wildcard symbol may retrieve word variants: (( a robust j. hermann book ) or ( a robert e. heimann (eebookss OR eeebookss) ))*.