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