Is it possible to combine two antifungal creams?

In theory, yes: This is not usually done, but in theory I suppose you could do it. This suggests to me that you have some problem that will not go away. In that case, I strongly advise you to see a doctor. You may NOT actually be afflicted by a fungus. Or, you may have used a topical steroid which HELPS fungus. So you have to be careful of that. I could see combining 2 creams, but I would separate them in time.