Quang’s rise, at a time of growing dissent on social media and challenges to the party’s authority, signaled limits to Vietnam’s liberal agenda, despite a growing openness to social change and sweeping economic reform, experts say. Quang, 61, died in a military hospital in Hanoi of a “serious illness despite efforts by domestic and international doctors and professors,” Vietnam Television said. Quang had been ill for months, said former health minister Nguyen Quoc Trieu, who now oversees healthcare for high-ranking officials.