<prompt> Bheka isigaba esingezansi bese uphendula umbuzo ngemuva kwalokho ngolimi olufanayo nesigaba: Isigaba: Ngo-1978, iBhange Likazwelonke laseVietnam Ngân hàng Nhà nước Việt Nam lethula imali enama-denomination ka-5 hào, 1, 5, 10, 20 no-50 đồng ngo-1976. Ngo-1980, kwanezelwa imali engu-2 no-10 đồng, kwalandelwa imali engu-30 no-100 đồng ngo-1981. Lezi zinhlamvu zemali zanqanyulwa ngo-1985 njengoba zalahlekelwa kancane kancane inani ngenxa yokwehla kwamandla emali nokungazinzi kwezomnotho. Umbuzo: Ibhange Likazwelonke laseVietnam lafaka nini imali engu-2 no-10 dong?  <response>: Ngo-1980 