Perhaps you should try some spelling variations:
associated factor » associated factors, associated pastors, associated vectors
associated vector » associated factors, associated secretory, associated infection
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 factor) OR (((associate director) OR (associated vector))))) OR (associate factor)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((associated factor) or (((associate director) OR (associated vector))))) or (associate factor))".
• Adding a wildcard symbol may retrieve word variants: ((((associated factor) or (((associate director) OR (associated vector))))) or (associate factor))*.