/ˌrɛfəˈrɛndəm/ – Noun
Definition: trưng cầu ý dân, thăm dò ý kiến toàn dân.
A more thorough explanation: A referendum is a direct vote in which the electorate is asked to either accept or reject a particular proposal, law, or constitutional amendment.
Example: The government decided to hold a referendum to allow the citizens to vote on the proposed constitutional amendment.