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

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

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