Perhaps you should try some spelling variations:
associated vector » associate director, associated secretory, associated infection
associate editor » associate editors, associate director, associated factor
associate factor » associate director, associate editors, associated fatty
bacteria » bacterial

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