Perhaps you should try some spelling variations:
"a robert j. heilman book" » "a robert j. german book", "3 robert j. heilman book", "dr robert j. heilman book", "a robot j. heilman book", "a robert _. heilman book", "a robert e. heilman book"
"a robust _. heimann book" » "a robust _. german book", "_ robust _. heimann book"
"a robust e. heimann ebook" » "_ robust e. heimann ebook", "a robust a. heimann ebook", "a robust end. heimann ebook", "a robust l1. heimann ebook"

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