/əˈkwaɪrd raɪts ˈdɒktrɪn/ – Noun
Definition: Nguyên tắc quyền lợi đã được hưởng.
A more throughout explanation: the legal principle that an immediate, fixed right cannot be limited by later laws passed by the government
Example: The acquired rights doctrine suggests that a change in the supreme power in a country cannot affect the interests of individuals.