/ˌrɛtroʊˈæktɪv ˌæplɪˈkeɪʃən ʌv lɔː/ – Phrase
Definition: vận dụng luật pháp ngược về trước, hiệu lực hồi tố của pháp luật.
A more thorough explanation: The retroactive (or retrospective) application of law refers to the application of a new law or legal principle to events or circumstances that occurred before the law was enacted or came into effect. This means that the law is applied backward in time to affect past actions or situations.
Example: The court ruled that the retroactive application of the new tax law was unconstitutional as it unfairly penalized individuals for actions taken before the law was enacted.