Basic.. But
Blood work, Chest X Ray, Ultrasound, ECG, Eyes, E.N.T., Internal/Surgery Exam,
Maybe no brain scan or treadmill, like China, but they have still caught a few guys who held 1st class Medicals from US, Australia and Mexico (to my personal knowledge) with issues.. In fairness, they will try to work with you and local or your specialist, if it is not an outright medical fail.
Always pays to do your own medical check beforehand. At VNA/Vietjet the medical is not part of the screening, so once in a while, prior to line training someone gets a call..sucks if you resigned from elsewhere..