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