How to get from Zhanjiang to Vietnam

You can fly to Hanoi and Ho Chi Minh City in Guangzhou, or you can take a bus to Nanning. You can take the train to Hanoi at 18: 20 every day (about 5: 30 am local time), or you can take a bus at Langdong Station and Youai Road to Friendship Pass and then transfer to Hanoi. There is a shuttle bus from Langdong Station to Hanoi at 7: 00 every morning. The fare is 148 yuan. It is said that there is a direct bus to Nanning in Da Nang, Vietnam. I wonder if there is a direct bus from Nanning to Da Nang. You can consult, but it will take three days and two nights. Not recommended ...