Perhaps you should try some spelling variations:
"a robert b. heimann books" » "a robert b. demand books", "a robert b. german books", "3 robert b. heimann books", "dr robert b. heimann books", "a robot b. heimann books", "a robert _. heimann books", "a robert e. heimann books", "a robert j. heimann books"
"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 e. heimann book", "a robert j. heimann book"
"a robust b. heimann book" » "a robust b. german book", "_ robust b. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust job. heimann book"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robert b. heimann book") OR ("a robert b. heimann books"))) or ("a robust b. heimann book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert b. heimann book") OR ("a robert b. heimann books"))) OR ("a robust b. heimann book")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert b. heimann book\") OR (\"a robert b. heimann books\"))) or (\"a robust b. heimann book\"))".
• Removing quotes may allow a broader search: (((( a robert b. heimann book ) OR ( a robert b. heimann books ))) or ( a robust b. heimann book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert b. heimann book") OR ("a robert b. heimann books"))) or ("a robust b. heimann book"))*.