In 2002, Huang was again stationed in Vietnam, this time as the representative at the Hanoi headquarters of the Taipei Economic and Cultural Office in Vietnam. There, he actively pursued bilateral agreements and cooperation memoranda between Taiwan and Vietnam, including agreements on investment guarantees and avoiding double taxation that extended legal protections to Taiwanese businesses in Vietnam.
2002 年，黃南輝再度派駐越南，擔任駐越南台北經濟文化辦事處代表，積極推動台越雙方簽署協定、合作備忘錄，如：投資保障協定、避免雙重課稅協定… 等，讓在越南投資的台商可以受到法律的保障。