interesting, coming from someone in germany. You do know how many people live in Germany right? You do know what the Germans did and can do today, I assume.
True you are smaller than China, but you are not less populous than Germany.
Also unification happened in 76, 3 years before Deng opened to the West. You suffered greatly in the war, yes, but China didn't come out smelling like roses after the Cultural Revolution.
If anything, the Vietnam government was far more united and it's military far more capable, than China in 79. I mean Deng was almost overthrown, if not for his military ties, but you still had your leader.
Frankly, you failure to adapt and your policies drove you to the ground, and now you want to come in and say if you had our materials, you be the most powerful in the world? You are not even the most powerful, in your region, and let me say ASEAN is in terrible shape, either a city state, or just wow.