Perhaps you should try some spelling variations:
heimann book » german book
goal robert » gal robert, deal robert, fogel robert
robert j » robert _, robert e
a robust » _ robust
robust e » robust _, robust a, robust end
heilmann » heilemann, heitmann, heilman
ebooks » books, ebook, redbooks

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( goal robert j. heimann book ) or ( a robust e. heilmann ebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( goal robert j. heimann book ) OR ( a robust e. heilmann ebooks )).
• Adding a wildcard symbol may retrieve word variants: (( goal robert j. heimann book ) or ( a robust e. heilmann ebooks ))*.