Perhaps you should try some spelling variations:
associate directors » associated vectors, associated sectors, associated receptors
associate director » associated vector
associate editor » associate editors, 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 (associate director))) OR (associate directors))) OR (associate factor)).
• Adding a wildcard symbol may retrieve word variants: ((((((associate editor) or (associate director))) or (associate directors))) or (associate factor))*.