Unfortunately, I doubt even the Vietnamese government has accurate accident metrics per capita/per km driven to compare to other countries.
But there is no real way to "just stay out of it". The public transportation infrastructure in Hanoi is pretty damn limited. There is a subway but I've never used it. I was told the government is hesitant to expand it as heroin junkies use it to shoot up. Your best chance is with taxis/Uber/Grab, so if the car hits someone at least you aren't the person responsible.
Anecdata: there was one probably life-threatening/ending accident when I was in Hanoi around Chinese New Years (dump truck vs moped). My Vietnamese buddy said that accidents were rare, but when they occur they are almost always gruesome. This isn't counting moped-on-moped scrapes that probably just result in a few bruises. I did witness some totally reckless teens basically crash through the traffic in front of them, knocking at least one woman off of her scooter....those 2 guys promptly got their asses beat by the nearest traffic cop.
I'm sure it works, but probably at a cost of a lot of lives, and probably a lot of people who just stay out of it.