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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robert e. heimann book") OR ("3 robert e. heimann book"))) or ("a robert e. heimann books"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert e. heimann book") OR ("3 robert e. heimann book"))) OR ("a robert e. heimann books")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert e. heimann book\") OR (\"3 robert e. heimann book\"))) or (\"a robert e. heimann books\"))".
• Removing quotes may allow a broader search: (((( a robert e. heimann book ) OR ( 3 robert e. heimann book ))) or ( a robert e. heimann books )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. heimann book") OR ("3 robert e. heimann book"))) or ("a robert e. heimann books"))*.