Perhaps you should try some spelling variations:
"a robust e. hermann books" » "a robust e. german books", "a robust e. hermann brochs", "a robust e. hermann broch", "a robust e. hermann lohrs", "_ robust e. hermann books", "a robust _. hermann books", "a robust a. hermann books", "a robust end. hermann books"
"a robert e. hermann book" » "a robert e. german book", "a robert e. hermann broch", "a robert e. hermann lohr", "3 robert e. hermann book", "dr robert e. hermann book", "a robot e. hermann book", "a robert _. hermann book", "a robert j. hermann book"
"a robert b. heimann book" » "a robert b. german book", "3 robert b. heimann book", "dr robert b. heimann book", "a robot b. heimann book", "a robert _. heimann book", "a robert j. heimann book", "a robert a. heimann book"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robert e. hermann book") or ("a robust e. hermann books"))) 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 e. hermann books"))) OR ("a robert b. heimann book")).
• Removing quotes may allow a broader search: (((( a robert e. hermann book ) or ( a robust e. hermann books ))) or ( a robert b. heimann book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. hermann book") or ("a robust e. hermann books"))) or ("a robert b. heimann book"))*.