Perhaps you should try some spelling variations:
"a robert b. hermann book" » "a robert b. german book", "a robert b. hermann broch", "a robert b. hermann lohr", "3 robert b. hermann book", "dr robert b. hermann book", "a robot b. hermann book", "a robert _. hermann book", "a robert e. hermann book", "a robert j. hermann book"
"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 e. heimann book", "a robert j. heimann book"
"a robust b. heitmann book" » "_ robust b. heitmann book", "a robust _. heitmann book", "a robust a. heitmann book", "a robust job. 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 robust b. heitmann book") or ((("a robert b. heimann book") OR ("a robert b. hermann book"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robust b. heitmann book") OR ((("a robert b. heimann book") OR ("a robert b. hermann book")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a robust b. heitmann book\") or (((\"a robert b. heimann book\") OR (\"a robert b. hermann book\"))))".
• Removing quotes may allow a broader search: (( a robust b. heitmann book ) or ((( a robert b. heimann book ) OR ( a robert b. hermann book )))).
• Adding a wildcard symbol may retrieve word variants: (("a robust b. heitmann book") or ((("a robert b. heimann book") OR ("a robert b. hermann book"))))*.