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 ebook" » "_ robust j. heimann ebook", "a robust _. heimann ebook", "a robust a. heimann ebook", "a robust job. heimann ebook"

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