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

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