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 factors))) OR (associated vector)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((associate editor) or (((((associate factor) OR (associated factors))) or (associated vector))))".
• Adding a wildcard symbol may retrieve word variants: ((associate editor) or (((((associate factor) OR (associated factors))) or (associated vector))))*.