I also live in Vietnam for 4 years now. The forced school closures have really impacted the economy.
All the school teachers are not getting paid and a lot are stiffed on their contracts. There is no viable actual recourse in Vietnm. Many have to leave the country as a result and now won't be back because they leave on bad terms. You see them posting constantly in the expat groups looking for help.
The teachers eat at all the expat places and tourism has been decimated... so all the non-local restaurants are suffering and will go out of business since they already operate on small margins. Viet landlords are more than happy (greedy) to have a place go empty than reduce rents... entire streets have shut down [1] literally over night.
Places like Halong Bay, who depend entirely on tourist revenue have stopped all cruises and those workers, who make tiny salaries, are now out of work.
What I'm trying to say is that the ripple effects are going to be huge in Vietnam... it isn't going to be pretty and it isn't going to magically fix itself over night. Especially as more cases keep cropping up.
[1] https://tuoitrenews.vn/news/business/20200305/stores-close-e...