Perhaps you should try some spelling variations:
"3 robert j. german books" » "3 robert j. german food", "3 robert j. german foods", "dr robert j. german books", "3 robert e. german books"
"a robert _. hermann book" » "a robert _. hermann broch", "a robert _. hermann lohr", "a robert _. hermann von", "dr robert _. hermann book", "a robot _. hermann book"
"a robust a. german book" » "a robust a. german food", "_ robust a. german book", "a robust _. german book", "a robust cat. german book", "a robust lca. german book"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("3 robert j. german books") or ("a robert _. hermann book"))) or ("a robust a. german book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("3 robert j. german books") OR ("a robert _. hermann book"))) OR ("a robust a. german book")).
• Removing quotes may allow a broader search: (((( 3 robert j. german books ) or ( a robert _. hermann book ))) or ( a robust a. german book )).
• Adding a wildcard symbol may retrieve word variants: (((("3 robert j. german books") or ("a robert _. hermann book"))) or ("a robust a. german book"))*.