Perhaps you should try some spelling variations:
"a robert e. hermann book" » "a robert e. hermann broch", "a robert e. hermann lohr", "a robert e. hermann von", "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. hermann broch", "a robust e. hermann lohr", "a robust e. hermann von", "_ robust e. hermann book", "a robust _. hermann book", "a robust a. hermann book", "a robust end. hermann book"
"a robert b. german book" » "a robert b. german books", "a robert b. german food", "3 robert b. german book", "dr robert b. german book", "a robot b. german book", "a robert _. german book", "a robert j. german book", "a robert a. german 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. german 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. german 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. german book\"))".
• Removing quotes may allow a broader search: (((( a robert e. hermann book ) OR ( a robust e. hermann book ))) or ( a robert b. german book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. hermann book") OR ("a robust e. hermann book"))) or ("a robert b. german book"))*.