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