Perhaps you should try some spelling variations:
associate director » associated vector
associate editor » associate editors, associated vector, associated factor
associated motor » associated memory, associated vector, associated factor
associate factor » associated factors, associated vector, associate editors

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((((associate editor) OR (associated motor))) OR (((associate editor) OR (associated motor))s))) OR (associate director))) OR (associate factor)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((associate editor) OR (associated motor))) or (((associate editor) OR (associated motor))s))) or (associate director))) or (associate factor))".
• Adding a wildcard symbol may retrieve word variants: ((((((((associate editor) OR (associated motor))) or (((associate editor) OR (associated motor))s))) or (associate director))) or (associate factor))*.