The user might be looking for a specific movie that's not well-known. Since I don't have up-to-date data on all films from 2021, especially in Vietnam, I should avoid making assumptions.
Perhaps there's a misunderstanding in their query. Maybe "sek" is part of a different context. But given the combination with "Viet Nam 2021", it's safer to assume they're referring to adult content.
I should be cautious here. The user might be asking for movie recommendations, but if it's explicit content, that's against policies. I need to balance between providing helpful info and adhering to guidelines.