Perhaps you should try some spelling variations:
associated vector » associated factors, associated secretory, associated infection
associated factor » associated factors, associated pastors, associated vectors
associate factor » associated factors, associate editors, associated fatty

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 factor))) OR (associate director))) OR (associate factor)).
• Adding a wildcard symbol may retrieve word variants: ((((((associated vector) or (associated factor))) or (associate director))) or (associate factor))*.