This is extremely plausible since not only is there China in the world, there is also Ind(ia). Of course, this will be a very big canvas since it will assume that Cathay's religion is Buddhism-equivalent from Ind, and we have no idea about Ind on that part apart from having thousand gods.
On the other hand, we can also twist the name and change it to "Journey to the East." What we have then is their Xuanzang and his entourage equivalent traveling to the New World to acquire sacred texts to spread the word of the religion back home. Since Cathay does not use Dark Magic exclusively, Naggaroth is out of question. This leaves us Lustria, which will mean that Cathay worships the Old Ones.
But wait! We can twist the direction even further with North (or South), giving the main characters a Chaotic twist as they traveled to, say, the Impossible Fortress to acquire Tzeentchian texts to spread the Raven God's influence in Cathay! Considering that Xuanzang is accompanied by anthropomorphized Monkey, Dragon/Horse, Pig, and Fish; the story has a decent chance to be Chaos.