The vehicles do not run on electricity. A nuclear power plant will not power them. $9 Billion might build the power plants, but it won't build the additional infrastructure to deliver that power all over the country to rural locations where the farms and factories need transportation fuel for trucks and tractors. It won't replace every vehicle for a short range electric mini-car.
That is not a replacement for a refinery and a country that needs transportation fuel for existing vehicles.
Do you really think another refinery is going to be all that helpful in the long run?
Yes. Vietnam is already a net exporter of Crude Oil but an imported of refined product. They need to expand their refining capabilities to use their own oil to better meet their own needs. That need is not going away in the future.
Vietnam already generates more electrical power than they use themselves and is a net exporter of electricity.
VIETNAM, Country Analysis Note (Energy)
http://www.eia.gov/countries/country-data.cfm?fips=VM&trk=m
Your suggestion is similar to telling someone who has more water than he can use, but not enough food, that he should spend his money digging another water well, not expanding his farm.
Touche! The problem, obviously, is that I did not know as much as I thought I did.
Any day that ends with less ignorance is a Good Day.