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 a. hermann book"
"a robert j. hermann book" » "a robert j. german book", "a robert j. hermann broch", "a robert j. hermann lohr", "3 robert j. hermann book", "dr robert j. hermann book", "a robot j. hermann book", "a robert _. hermann book", "a robert e. hermann book"
"a robust _. heitmann book" » "_ robust _. heitmann book", "a robust _. heimann book", "a robust _. heinemann book", "a robust _. hartmann book"

Try widening your search to All Fields.

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 b. hermann book") OR ("a robert j. hermann book"))) or ("a robust _. heitmann book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert b. hermann book") OR ("a robert j. hermann book"))) OR ("a robust _. heitmann book")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert b. hermann book\") OR (\"a robert j. hermann book\"))) or (\"a robust _. heitmann book\"))".
• Removing quotes may allow a broader search: (((( a robert b. hermann book ) OR ( a robert j. hermann book ))) or ( a robust _. heitmann book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert b. hermann book") OR ("a robert j. hermann book"))) or ("a robust _. heitmann book"))*.