The Vietnamese phrase "nào hay" can be understood in different contexts, but it generally conveys a sense of uncertainty or a question about knowledge regarding a situation. It can mean "no one knows," "no one could tell," or "no one can tell."
Conversation about an unexpected event:
Reflecting on a misfortune:
While "nào hay" primarily conveys uncertainty, in different contexts, "nào" can imply options (like "which one") and "hay" can describe something being good or interesting. Therefore, the meaning can shift based on the context in which it is used.