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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("3 robert e. hellman book") or ("a robert e. heimann book"))) or ("a robust e. heilman book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("3 robert e. hellman book") OR ("a robert e. heimann book"))) OR ("a robust e. heilman book")).
• Removing quotes may allow a broader search: (((( 3 robert e. hellman book ) or ( a robert e. heimann book ))) or ( a robust e. heilman book )).
• Adding a wildcard symbol may retrieve word variants: (((("3 robert e. hellman book") or ("a robert e. heimann book"))) or ("a robust e. heilman book"))*.