Perhaps you should try some spelling variations:
"a robust b. german book" » "a robust b. german books", "a robust b. german food", "_ robust b. german book", "a robust _. german book", "a robust a. german book", "a robust job. german book"
"a robust b. heimann book" » "_ robust b. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust job. heimann book"
"3 robert j. heilmann ebook" » "dr robert j. heilmann ebook", "3 robert _. heilmann ebook", "3 robert e. heilmann ebook", "3 robert j. heilemann ebook", "3 robert j. heitmann ebook", "3 robert j. heilman ebook"

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

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