What Vietnamese language centres actually check
Vietnam's language-centre market is the most accessible in Southeast Asia for non-native and no-degree teachers, but that doesn't mean anything gets accepted. Recruiters in Hanoi's Cau Giay district or HCMC's District 1 typically ask for proof of an accredited course of at least 100-120 hours, and they will ask to see the certificate, not just take your word for it.
What they rarely care about is whether the course was taken online — Vietnam is one of the more relaxed markets on this point compared with Japan or Korea. What they do notice is a certificate from a provider they've never heard of with no assessed component, which reads as a red flag during document checks for the work permit.
