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