Perhaps you should try some spelling variations:
"a robert _. heitmann book" » "gal robert _. heitmann book", "a robust _. heitmann book", "a robert _. heimann book", "a robert _. heinemann book", "a robert _. hermann book", "a robert _. heitmann books", "a robert _. heitmann ebook"
"a robert b. heilmann ebooks" » "gal robert b. heilmann ebooks", "a robust b. heilmann ebooks", "a robert e. heilmann ebooks", "a robert j. heilmann ebooks", "a robert a. heilmann ebooks", "a robert b. heilmann ebookss", "a robert b. heilmann eebooks", "a robert b. heimann ebooks", "a robert b. heinemann ebooks", "a robert b. hermann ebooks", "a robert b. heilmann books", "a robert b. heilmann ebook"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("a robert _. heitmann book") or ("a robert b. heilmann ebooks"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert _. heitmann book") OR ("a robert b. heilmann ebooks")).
• Removing quotes may allow a broader search: (( a robert _. heitmann book ) or ( a robert b. heilmann ebooks )).
• Adding a wildcard symbol may retrieve word variants: (("a robert _. heitmann book") or ("a robert b. heilmann ebooks"))*.