Perhaps you should try some spelling variations:
associated secretory » associated factors, associated operators
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 factor) OR (associate director))) OR (associated secretory)))).
• Adding a wildcard symbol may retrieve word variants: ((associate editor) or (((((associate factor) or (associate director))) or (associated secretory))))*.