Perhaps you should try some spelling variations:
"_ robust b. heitmann book" » "_ robust _. heitmann book", "_ robust a. heitmann book", "_ robust job. heitmann book", "_ robust b. heitmann books", "_ robust b. heitmann ebook"
"a robert b. heilman ebooks" » "3 robert b. heilman ebooks", "dr robert b. heilman ebooks", "a robust b. heilman ebooks", "a robert _. heilman ebooks", "a robert e. heilman ebooks", "a robert j. heilman ebooks", "a robert b. heilman ebookss", "a robert b. heilman eebooks", "a robert b. heilmann ebooks", "a robert b. hellman ebooks", "a robert b. helman ebooks", "a robert b. heilman books", "a robert b. heilman ebook", "a robert b. heilman redbooks"

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

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