Perhaps you should try some spelling variations:
"a robert j. hermann book" » "a robert j. german book", "a robert j. hermann broch", "a robert j. hermann lohr", "3 robert j. hermann book", "dr robert j. hermann book", "a robust j. hermann book", "a robert e. hermann book"
"a robert _. hermann book" » "a robert _. german book", "a robert _. hermann broch", "a robert _. hermann lohr", "3 robert _. hermann book", "dr robert _. hermann book", "a robust _. hermann book"
"a robert b. heitmann book" » "3 robert b. heitmann book", "dr robert b. heitmann book", "a robust b. 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 j. hermann book") or ("a robert _. hermann book"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert b. heitmann book") OR ((("a robert j. hermann book") OR ("a robert _. hermann book")))).
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• Adding a wildcard symbol may retrieve word variants: (("a robert b. heitmann book") or ((("a robert j. hermann book") or ("a robert _. hermann book"))))*.