/ʌnˈsɒlvd keɪs/ – Phrase
Definition: vụ án không được giải quyết, hành vi phạm tội chưa bị cảnh sát khám phá ra.
A more thorough explanation: An unsolved case refers to a criminal investigation or legal matter that has not been resolved or concluded, typically due to a lack of evidence, leads, or successful prosecution.
Example: The police are still investigating the unsolved case of the missing person.