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