Perhaps you should try some spelling variations:
janett robert » barnett robert, marett robert, arnott robert
hermann lohr » hermann von
hermann der » hermann kurz
robert e » robert _, robert j
a robust » _ robust
heitmann » heimann, heinemann, hartmann
eeebooks » redbooks, ebooks, texbooks

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: (( janett robert e. ((hermann lohr) OR (hermann der)) ) OR ( a robust _. heitmann eeebooks ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( janett robert e. ((hermann lohr) OR (hermann der)) ) or ( a robust _. heitmann eeebooks ))~".
• Adding a wildcard symbol may retrieve word variants: (( janett robert e. ((hermann lohr) OR (hermann der)) ) or ( a robust _. heitmann eeebooks ))*.