Perhaps you should try some spelling variations:
"a robert _. heimann book" » "a robert _. german book", "3 robert _. heimann book", "dr robert _. heimann book", "a robot _. heimann book"
"a robert e. hermann book" » "a robert e. german book", "a robert e. hermann broch", "a robert e. hermann lohr", "3 robert e. hermann book", "dr robert e. hermann book", "a robot e. hermann book", "a robert j. hermann book"
"a robust e. heilman ebook" » "_ robust e. heilman ebook", "a robust _. heilman ebook", "a robust a. heilman ebook", "a robust end. heilman ebook", "a robust e. heilmann ebook", "a robust e. hellman ebook", "a robust e. helman ebook"

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