The Vietnamese specialise in nail bars and cannabis growing , the former seldom visited by immigration officers and the latter is a booming business as the police don't seem to care and figures Like Sadick Khun want to legalise it.
The tragic case of the 2019 deaths highlights that all the dead came from relatively well off villages and were purely economic illegal migrants who woujld have worked in the black economy.
I travel to Vietnam regularly, the economy is booming nationwide, all people have access to basics such as medical care, education etc. It is a safe country with low crime . Salaries are of course low compared to the UK but so is the cost of living.