Perhaps you should try some spelling variations:
"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 robust j. hermann book", "a robert _. hermann 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 robust e. hermann book", "a robert _. hermann book"
"a robert a. hartmann von" » "3 robert a. hartmann von", "dr robert a. hartmann von", "a robust a. hartmann von", "a robert _. hartmann von"

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