القاعدة ذات الصلة
Viet Nam
Practice Relating to Rule 100. Fair Trial Guarantees
Section H. Assistance of an interpreter
Viet Nam’s Criminal Procedure Code (2003) states:
Spoken and written language used in the criminal procedure is Vietnamese. Participants in the criminal procedure may use spoken and written languages of their own nationalities; in this case, interpreters shall be required. 
Viet Nam, Criminal Procedure Code, 2003, § 24.