/ˈɑpəˌreɪtɪv ruːl/ – Phrase
Definition: quy phạm hiện hành.
A more thorough explanation: An operative rule is a legal principle or regulation that is currently in effect and governs the conduct or decision-making process within a particular jurisdiction or context. It is a rule that is actively applied and enforced by authorities or institutions to guide actions, resolve disputes, or regulate behavior in accordance with established laws or policies.
Example: The court applied the operative rule of law in determining the admissibility of the evidence.