<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Ngo-1978, iBhange Likazwelonke laseVietnam Ngân hàng Nhà nước Việt Nam laqala ukufaka amanothi ezinhlamvu ze-5 hào, 1, 5, 10, 20, kanye ne-50 đồng ngo-1976. Ngo-1980, kwanezelwa amabhange angu-2 no-10 venge, alandelwa amabhange angu-30 no-100 venge ngo-1981. Lezi zinhlamvu zemali zanqanyulwa ngo-1985 njengoba kancane kancane zalahlekelwa inani ngenxa yokwehla kwamandla emali nokungazinzi kwezomnotho. Umbuzo: I-State Bank yaseVietnam yafaka nini izinhlamvu zemali zama-dollar amabili neziyishumi?  <response>: Ngo-1980 