Perhaps you should try some spelling variations:
"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 robert _. hermann book", "a robert j. hermann book"
"a robot e. hermann book" » "a robot e. german book", "a robot e. hermann broch", "a robot e. hermann lohr", "_ robot e. hermann book", "a robot _. hermann book", "a robot 1. hermann book", "a robot 5. hermann book"
"a robust j. heimann book" » "a robust j. german book", "_ robust j. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust job. heimann 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 robot e. hermann book"))) or ("a robust j. heimann book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert e. hermann book") OR ("a robot e. hermann book"))) OR ("a robust j. heimann book"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert e. hermann book\") OR (\"a robot e. hermann book\"))) or (\"a robust j. heimann book\"))*".
• Removing quotes may allow a broader search: (((( a robert e. hermann book ) OR ( a robot e. hermann book ))) or ( a robust j. heimann book ))*.