Hanoi has a direct train to Nanning, and Ho Chi Minh has a direct train to Hanoi. However, it is still recommended not to take the train in Vietnam, which is slow and expensive. Suggested route: From Ho Chi Minh to Hanoi by bus or plane, Vietnam Airlines is about 1 trieu 5, so it is 600 RMB, jestar is about 1 trieu 5, so it is about 400 RMB, and the bus is about 600nghin, so it is 200 RMB. Then take a bus back to Nanning in Hanoi, about 150 RMB. It's a day and a night from Ho Chi Minh to Hanoi by bus, and it takes two hours by plane. It takes about 6 hours to drive from Hanoi to Nanning. Cheap and convenient. I often do ~ ~ ~