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

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