While Vietnam definitely has some issues about freedom of the press and so on,
At the moment they do seem to be not suppressing Coronavirus news from legit sources or hiding whats going on. They have actually been quite open with case numbers, every case out in the wild there is a list of where they have been and so on in the papers, text messages and the usual social media apps like zalo with reports to contact the government., it seems they are relying on this information helping them to quarantine and track down potentially infected as they're quite aggressive in quarantining an area if they think there is risk.
Also sent to corrections, Vietnam started its lockdown on 1st April at midnight.
Biting the hand that feeds IT
