Perhaps you should try some spelling variations:
"a robert j. german books" » "a robert j. german food", "a robert j. german foods", "3 robert j. german books", "dr robert j. german books", "a robust j. german books", "a robert _. german books", "a robert e. german books"
"a robert j. german book" » "a robert j. german food", "3 robert j. german book", "dr robert j. german book", "a robust j. german book", "a robert _. german book", "a robert e. german book"
"a robert j. heilman ebooks" » "3 robert j. heilman ebooks", "dr robert j. heilman ebooks", "a robust j. heilman ebooks", "a robert _. heilman ebooks", "a robert e. heilman ebooks", "a robert j. heilmann ebooks", "a robert j. hellman ebooks", "a robert j. helman ebooks", "a robert j. heilman ebook", "a robert j. heilman redbooks", "a robert j. heilman texbooks"

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