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

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