Perhaps you should try some spelling variations:
"a robot b. german book" » "a robot b. german books", "a robot b. german food", "_ robot b. german book", "a robust b. german book", "a robot _. german book", "a robot 1. german book", "a robot 5. german book"
"3 robert b. heitmann ebooks" » "dr robert b. heitmann ebooks", "3 robert _. heitmann ebooks", "3 robert e. heitmann ebooks", "3 robert j. heitmann ebooks", "3 robert b. heitmann books", "3 robert b. heitmann ebook", "3 robert b. heitmann redbooks"
"a robot b. heimann book" » "_ robot b. heimann book", "a robust b. heimann book", "a robot _. heimann book", "a robot 1. heimann book", "a robot 5. heimann book"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robot b. heimann book") OR ("a robot b. german book"))) or ("3 robert b. heitmann ebooks"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robot b. heimann book") OR ("a robot b. german book"))) OR ("3 robert b. heitmann ebooks"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robot b. heimann book\") OR (\"a robot b. german book\"))) or (\"3 robert b. heitmann ebooks\"))*".
• Removing quotes may allow a broader search: (((( a robot b. heimann book ) OR ( a robot b. german book ))) or ( 3 robert b. heitmann ebooks ))*.