Perhaps you should try some spelling variations:
"a robust e. heimann book" » "a robust e. german book", "_ robust e. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust end. heimann book"
"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 e. heimann ebook" » "_ robust e. heimann ebook", "a robust _. heimann ebook", "a robust a. heimann ebook", "a robust end. heimann ebook"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("a robert j. heilman book") or ((("a robust e. 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 e. heimann book") OR ("a robust e. heimann ebook")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a robert j. heilman book\") or (((\"a robust e. heimann book\") OR (\"a robust e. heimann ebook\"))))".
• Removing quotes may allow a broader search: (( a robert j. heilman book ) or ((( a robust e. heimann book ) OR ( a robust e. heimann ebook )))).
• Adding a wildcard symbol may retrieve word variants: (("a robert j. heilman book") or ((("a robust e. heimann book") OR ("a robust e. heimann ebook"))))*.