As someone who lives in Vietnam, I'd disagree with this statement. It functions at the whim of all of the foreign investment, not of any particular genius on its part.
As for who won what, it's way more nuanced then you are presenting.
The US wasn't really in Vietnam to win anything, but there to stop the North from capturing the South, which it did quite easily until the money dried up. There was a reason the US never went north of the 17th parallel and it wasn't because the North was beating them back. Saigon didn't fall until two years after the US pulled out.
Militarily, the US was maintaining a kill ratio of 134:1 until the pull out. The NVA rarely won a battle in military terms. The Tet Offensive was a failure too, from a military perspective anyways.
I don't personally believe the US should have been here and am anti-war in most circumstances, but growing up in a household with three Vietnam vets (my grandfather served in Saigon for 8 years as a Colonel, my dad, my uncle died in Danang) I'm fairly studied on the situation. I don't think anyone "won", especially after living here for five years. Everyone was a loser imho.