/ˈsɜːtɪfɪkət əv ˈsɜːvɪs/ – Phrase
Definition: Chứng chỉ xác nhận việc phục vụ.
A more thorough explanation: a piece of paper attached to a document filed with the court stating that the document has been properly given to all other parties involved
Example: This Practice Note covers the certificate of service, why it is required and what information is necessary.