Perhaps you should try some spelling variations:
gail robert » gal robert, davis robert, blair robert
robert j » robert _, robert e
a robust » _ robust
robust e » robust _, robert e
book » ebook
books » ebooks
ebooks » eebooks
eebooks » eeebooks
heilman » heilmann, hellman, heitmann

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( gail robert j. hermann (book OR books) ) or ( a robust e. heilman (ebooks or eebooks) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gail robert j. hermann (book OR books) ) OR ( a robust e. heilman (ebooks OR eebooks) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( gail robert j. hermann (book OR books) ) or ( a robust e. heilman (ebooks or eebooks) ))*".