/ɪˈfɪkəʃəs lɔː/ – Phrase
Definition: luật hiện hành có hiệu lực.
A more throughout explanation: “Efficacious law” refers to a legal principle or regulation that is effective in achieving its intended purpose or producing the desired outcome. It denotes a law that is capable of producing the desired result or effect in practice.
Example: The new legislation proved to be efficacious in reducing crime rates in the city.