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