Perhaps you should try some spelling variations:
"_ robust e. hellman book" » "_ robust e. hellman joel", "_ robust _. hellman book"
"a robert e. heitmann book" » "gal robert e. heitmann book", "a robust e. heitmann book", "a robert _. heitmann book", "a robert j. heitmann book", "a robert e. heimann book", "a robert e. heinemann book", "a robert e. hartmann book"
"a robert e. hermann book" » "gal robert e. hermann book", "a robust e. hermann book", "a robert _. hermann book", "a robert j. hermann 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. heitmann book") OR ("a robert e. hermann book"))) or ("_ robust e. hellman book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert e. heitmann book") OR ("a robert e. hermann book"))) OR ("_ robust e. hellman book")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert e. heitmann book\") OR (\"a robert e. hermann book\"))) or (\"_ robust e. hellman book\"))".
• Removing quotes may allow a broader search: (((( a robert e. heitmann book ) OR ( a robert e. hermann book ))) or ( _ robust e. hellman book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. heitmann book") OR ("a robert e. hermann book"))) or ("_ robust e. hellman book"))*.