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", "dr robert e. hermann book", "a robust e. hermann book", "a robot e. hermann book", "a robert _. hermann book"
"a robert j. german book" » "a robert j. german books", "a robert j. german food", "dr robert j. german book", "a robust j. german book", "a robot j. german book", "a robert _. german book"
"3 robert j. heimann book" » "3 robert _. heimann book", "dr robert j. heimann 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 j. german book") or ("3 robert j. heimann book"))) or ("a robert e. hermann book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert j. german book") OR ("3 robert j. heimann book"))) OR ("a robert e. hermann book")).
• Removing quotes may allow a broader search: (((( a robert j. german book ) or ( 3 robert j. heimann book ))) or ( a robert e. hermann book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert j. german book") or ("3 robert j. heimann book"))) or ("a robert e. hermann book"))*.