In China, if you are not getting new quests, there are basically two places to look:
- In Digjong
- In the Temple of the 5 Dragons (found on the Main China map)
When you have finished an entire dragon quest line, the dragon isn't nice enough to tell you where to go to next. You'll need to remember to go to Digjong and find the monk of the current dragon. The monk of the current dragon will tell you where to find the monk of the next dragon.