Perhaps you should try some spelling variations:
"a robert b. heimann book" » "a robert b. german book", "3 robert b. heimann book", "dr robert b. heimann book", "a robot b. heimann book", "a robert _. heimann book", "a robert j. heimann book", "a robert a. heimann book"
"a robust b. heimann book" » "a robust b. german book", "_ robust b. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust job. heimann book"
"a robert e. heitmann book" » "3 robert e. heitmann book", "dr robert e. heitmann book", "a robot e. heitmann book", "a robert _. heitmann book", "a robert j. heitmann book"

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 e. 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 e. 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 e. heitmann book\") or (((\"a robert b. heimann book\") OR (\"a robust b. heimann book\"))))".
• Removing quotes may allow a broader search: (( a robert e. heitmann book ) or ((( a robert b. heimann book ) OR ( a robust b. heimann book )))).
• Adding a wildcard symbol may retrieve word variants: (("a robert e. heitmann book") or ((("a robert b. heimann book") OR ("a robust b. heimann book"))))*.