/ˈpraɪˌmɛri ˌlɛdʒɪsˈleɪʃən/ – Phrase
Definition: Luật cơ bản.
A more thorough explanation: legislation made by the legislative branch of government, rather than rules and regulations made by an authority under powers given to them by primary legislation
Example: Primary legislation is effectively the type of laws passed by Parliament, and lays down the scope of legislation. Secondary legislation governs the way those laws work in practice.