Perhaps you should try some spelling variations:
"a robust e. hermann lohr" » "a robust e. hermann von", "_ robust e. hermann lohr", "a robust _. hermann lohr", "a robust a. hermann lohr", "a robust end. hermann lohr"
"a robust e. hermann der" » "a robust e. hermann kurz", "_ robust e. hermann der", "a robust _. hermann der", "a robust a. hermann der", "a robust end. hermann der"
"a robert j. heilman ebook" » "3 robert j. heilman ebook", "dr robert j. heilman ebook", "a robot j. heilman ebook", "a robert _. heilman ebook", "a robert e. heilman ebook", "a robert j. heilmann ebook", "a robert j. hellman ebook", "a robert j. helman ebook"

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