Perhaps you should try some spelling variations:
"a robust e. heilman books" » "a robust e. german books", "_ robust e. heilman books", "a robust _. heilman books", "a robust a. heilman books", "a robust end. heilman books"
"3 robert _. german book" » "3 robert _. german books", "3 robert _. german food", "dr robert _. german book"
"a robert e. heilman book" » "dr robert e. heilman book", "a robot e. heilman book", "a robert j. heilman 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 ("3 robert _. german book"))) or ("a robust e. heilman books"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert e. heilman book") OR ("3 robert _. german book"))) OR ("a robust e. heilman books")).
• Removing quotes may allow a broader search: (((( a robert e. heilman book ) or ( 3 robert _. german book ))) or ( a robust e. heilman books )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. heilman book") or ("3 robert _. german book"))) or ("a robust e. heilman books"))*.