Perhaps you should try some spelling variations:
associated factors » associated bacteria
associated vector » associated secretory, associated infection, associated operators
associate editor » associate editors, associate factor, associated factor

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