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