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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robert e. heilman book") OR ("a robert e. heilman books"))) or ("a robust e. heilman book"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("a robert e. heilman book") OR ("a robert e. heilman books"))) or ("a robust e. heilman book"))*.