Perhaps you should try some spelling variations:
"davis robert j. heilmann book" » "davis robert _. heilmann book", "david robert j. heilmann book", "davis robert j. heilemann book", "davis robert j. heimann book", "davis robert j. heilman book", "davis robert j. heilmann books", "davis robert j. heilmann ebook"
"a robert e. heitmann eebooks" » "3 robert e. heitmann eebooks", "dr robert e. heitmann eebooks", "a robust e. heitmann eebooks", "a robert _. heitmann eebooks", "a robert e. heitmann eebookss", "a robert e. heitmann eeebooks", "a robert e. heitmann ebooks", "a robert e. heitmann redbooks", "a robert e. heitmann texbooks"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("davis robert j. heilmann book") OR ("a robert e. heitmann eebooks"))~.
• Removing quotes may allow a broader search: (( davis robert j. heilmann book ) or ( a robert e. heitmann eebooks ))~.
• Adding a wildcard symbol may retrieve word variants: (("davis robert j. heilmann book") or ("a robert e. heitmann eebooks"))*.