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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("a robert b. heitmann book") or ((("a robert b. heimann book") or ("3 robert j. heimann book"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert b. heitmann book") OR ((("a robert b. heimann book") OR ("3 robert j. heimann book")))).
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• Adding a wildcard symbol may retrieve word variants: (("a robert b. heitmann book") or ((("a robert b. heimann book") or ("3 robert j. heimann book"))))*.