Travel from Changsha to Vietnam

You don't want to take the train in Vietnam! If you are a family, I suggest that you charter a car in Vietnam, and the cost is about 20 trillion yuan a week (it is a business car, which can take 12 people). No matter how good your English is, it is necessary to hire a local translator. Most Vietnamese don't understand English! I have never been to Yazhuang, only to Hanoi, Haiphong, Tushan and Halong Bay. So no, I don't know much about it. However, you don't need to worry too much about the cost of accommodation. Local hotels in Vietnam are generally not expensive, but I'll give you a piece of advice. If the hotel is run by Vietnamese locals, don't go door to door, because you will know when you go.