I would ask Chatgpt that question. You cannot assume that laws relating to drug importation are remotely similar in different countries. Peptides grey status in the US definitely does not apply in the UK or Australia, it is unquestionably illegal to import them without a specific permit in Australia and you could be charged if customs seized them ( though it is not very likely, unless they were something especially frowned upon like anabolic steroids ). I had to look up Malaysian rules a few weeks ago as my daughter with adhd was going there. Without the right doctors letter to go with her medication, caning is a possible punishment, although probably unlikely, and they most definitely have the death penalty for importing some types of drugs. No idea for Vietnam so without someone local to ask, I would go with Chatgpt. I found it useful when trying to work out the legality of importing peptides here.