Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
gal robert » hall robert
robert j » robert _, robert e
a robert » 3 robert, dr robert, a robot
a robust » _ robust
heilman » heilmann, hellman, helman
eebooks » redbooks, texbooks

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) OR (a robust)) e. heilman (ebooks or eebooks) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gal robert j. hermann book ) OR ( ((a robert) OR (a robust)) e. heilman (ebooks OR eebooks) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gal robert j. hermann book ) or ( ((a robert) OR (a robust)) e. heilman (ebooks or eebooks) ))".
• Adding a wildcard symbol may retrieve word variants: (( gal robert j. hermann book ) or ( ((a robert) OR (a robust)) e. heilman (ebooks or eebooks) ))*.