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