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