No doubt. I have always admired Vietnam and the resiliency of its people. During my school days, the chapter on US-Vietnam war was my favorite. I knew it by heart.
China doesn't play a junior role my friend. And Vietnam is indeed attracting, still, to a large extent what is leaving China.
Vietnam's electronics exports are in fact an example of the same thing. Vietnamese factories largely do the assembly and basic work on electronic products while almost all components are imported.
China's share in your imports is high, and the reason is that you need those intermediary Chinese products as components in your own supply chains.
This also shows in per capita GDP levels where you are around 3000 USD, whereas China is closer to 8500 USD.
Definitely Korea and Japan can help, but you can never ignore China.
Which estimates?