/ˈnʌləti sut/ – Phrase
Definition: vụ kiện xin tiêu hủy (một chứng thư, một thỏa thuận..).
A more thorough explanation: A nullity suit is a legal action brought to challenge the validity of a contract, marriage, or other legal document. The purpose of a nullity suit is to have the document declared null and void, as if it never existed, due to some defect or legal issue that renders it invalid.
Example: In the nullity suit, the plaintiff is seeking to have the contract declared void due to lack of capacity to enter into a legal agreement.