Perhaps you should try some spelling variations:
mycobacteria intracellular » mycobacterium intracellulare
22bacterial extracellular » bacterial extracellular, mycobacterial extracellular, bacteria intracellular
bacterial intracellular » bacterial extracellular, bacterial cellular, factors intracellular

Try widening your search to All Fields.

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: %((22bacterial extracellular) OR (((bacterial intracellular) OR (mycobacteria intracellular)))) secretion%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22bacterial extracellular) or (((bacterial intracellular) OR (mycobacteria intracellular)))) secretion%22".
• Adding a wildcard symbol may retrieve word variants: %((22bacterial extracellular) or (((bacterial intracellular) OR (mycobacteria intracellular)))) secretion%22*.