Perhaps you should try some spelling variations:
associated bacterial » associated bacteria, associated factors, associated microbial
associated vectors » associated vector, associated factors, associated receptors
associate editor » associate editors, associate factor, associate director

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 vectors))) OR (associated bacterial)).
• Adding a wildcard symbol may retrieve word variants: ((((associate editor) or (associated vectors))) or (associated bacterial))*.