Please give us address for bus and train station in Nanning for Guangzhou and Vietnam border. How much does it cost and how to buy the ticket. Thank you.

Thien

The through train ticket till Ha Noi is 46.12 CHF (Swiss Franc) in 1/4 (first class 4-bed compartment). You have to pay in RMB equivalent of 46.12 Swiss Franc. This is a so-called MPT ticket of SMPS.

Train to VN departs Nanning Mondays and Fridays at 21:15, change the train at the border, arrive HaNoi 8:10

FYI:
- The international train ticket part has 20% discount on the round-trips.
- The international ticket is valid 2 month "there" and 4 month "round-trip". You can get the r/t ticket without the reservation or with "open" reservation for the return part.
- "Round-trip" is considered going "there" and "back", not necessary to the same station. You can buy for instance Nanning->HaNoi "there" and HaNoi->Beijing "back" and it would qualify for 20% discount (only the ticket portion, not the reservation).

How such MPT tickets look like see my home page.

What do you need to buy? Your question is a little confusing.
No need for any "address" for bus and train stations in China. Have the Chinese characters for "long-distance bus station" and "train station" printed out to show the taxi driver, and they'll drive you there.

He actually needs the address of LüXingShe office - they sell the international tickets (see above). They could be at the station, or maybe not. Sometimes "foreigners" office at the station would sell these tickets as well.