Perhaps you should try some spelling variations:
"gal robert j. heimann book" » "gal robert _. heimann book", "gal robert e. heimann book", "goal robert j. heimann book", "gael robert j. heimann book", "gail robert j. heimann book", "gal robert j. hermann book", "gal robert j. heinemann book", "gal robert j. heimann books", "gal robert j. heimann ebook"
"_ robert b. heitmann ebooks" » "_ robert _. heitmann ebooks", "_ robert e. heitmann ebooks", "_ robert a. heitmann ebooks", "_ robert b. heitmann ebookss", "_ robert b. heitmann eebooks", "_ robert b. heinemann ebooks", "_ robert b. hermann ebooks", "_ robert b. hartmann ebooks", "_ robert b. heitmann books", "_ robert b. heitmann ebook"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("gal robert j. heimann book") OR ("_ robert b. heitmann ebooks"))~.
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