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

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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. heimann book") OR ("a robust b. heimann book"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert _. heitmann book") OR ((("a robert b. heimann book") OR ("a robust b. heimann book")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a robert _. heitmann book\") or (((\"a robert b. heimann book\") OR (\"a robust b. heimann book\"))))".
• Removing quotes may allow a broader search: (( a robert _. heitmann book ) or ((( a robert b. heimann book ) OR ( a robust b. heimann book )))).
• Adding a wildcard symbol may retrieve word variants: (("a robert _. heitmann book") or ((("a robert b. heimann book") OR ("a robust b. heimann book"))))*.