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 robust e. heilman book", "a robert _. heilman book"
"a robert j. heilman book" » "a robert j. german book", "3 robert j. heilman book", "dr robert j. heilman book", "a robust j. heilman book", "a robert _. heilman book"
"_ robust a. heilmann book" » "_ robert a. heilmann book", "_ robust _. heilmann book", "_ robust cat. heilmann book", "_ robust lca. heilmann book", "_ robust a. heilemann book", "_ robust a. heimann book", "_ robust a. heitmann book"

Try widening your search to All Fields.

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