Perhaps you should try some spelling variations:
"a robert _. hartmann book" » "a robert _. hartmann sonke", "a robert _. hartmann von", "dr robert _. hartmann book", "a robust _. hartmann book", "a robot _. hartmann book"
"a robert b. hermann lohr" » "a robert b. hermann der", "a robert b. hermann von", "dr robert b. hermann lohr", "a robust b. hermann lohr", "a robot b. hermann lohr", "a robert j. hermann lohr", "a robert a. hermann lohr"
"3 robert e. hermann book" » "3 robert e. german book", "3 robert e. hermann broch", "3 robert e. hermann von", "dr robert e. hermann book", "3 robert j. hermann 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 _. hartmann book") or ((("a robert b. hermann lohr") or ("3 robert e. hermann book"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert _. hartmann book") OR ((("a robert b. hermann lohr") OR ("3 robert e. hermann book")))).
• Removing quotes may allow a broader search: (( a robert _. hartmann book ) or ((( a robert b. hermann lohr ) or ( 3 robert e. hermann book )))).
• Adding a wildcard symbol may retrieve word variants: (("a robert _. hartmann book") or ((("a robert b. hermann lohr") or ("3 robert e. hermann book"))))*.