Perhaps you should try some spelling variations:
"a robert e. heimann book" » "gal robert e. heimann book", "a robert _. heimann book", "a robert j. heimann book", "a robert e. heinemann book", "a robert e. heimann books", "a robert e. heimann ebook"
"a robert e. hermann book" » "gal robert e. hermann book", "a robert _. hermann book", "a robert j. hermann book", "a robert e. hermann books", "a robert e. hermann ebook"
"a robust e. heilmann book" » "_ robust e. heilmann book", "a robust _. heilmann book", "a robust e. heilmann books", "a robust e. heilmann ebook", "a robust e. heitmann book", "a robust e. heinemann book", "a robust e. hellman book"

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