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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dr robert j. heilman ebook") or ((("a robust e. hermann lohr") or ("a robust e. hermann von"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dr robert j. heilman ebook") OR ((("a robust e. hermann lohr") OR ("a robust e. hermann von")))).
• Removing quotes may allow a broader search: (( dr robert j. heilman ebook ) or ((( a robust e. hermann lohr ) or ( a robust e. hermann von )))).
• Adding a wildcard symbol may retrieve word variants: (("dr robert j. heilman ebook") or ((("a robust e. hermann lohr") or ("a robust e. hermann von"))))*.