Vietnam has a considerable "surplus" population in the countryside -- meaning that the same production with the same input of labor could be achieved with far fewer hands. Everyone though now is well fed and educated and so the urbanization has slowed.
Do the basic maths - many times the initial basic cost and an ongoing cost not experienced by conventional wells throughout the lifetime of the well.
Fracking can be done, but the energy is not affordable by most consumers of the product. This matters not to the gas producers who will find a buyer whatever the cost, but the same cannot be said for your Vietnamese peasant farmer.
For these very reasons the main Fracking operator in America has hit a cash flow crisis and almost went bankrupt last year. This is a speculators bubble not an energy revolution. It can make a modest contribution to energy needs - but a world where Fracking makes economic sense will not6 be the world you are used to and will not be a pleasant place to live for any but the Middle classes upwards.
I have not even touched on the likely environmental costs of even trying to square the Fracking circle.