Answer
The successors of Quang Trung, the Tây Sơn dynasty, lacked a clear succession plan, leading to instability and power struggles. Unlike the Nguyễn dynasty, which had a well-defined succession system based on primogeniture, the Tây Sơn rulers often designated their successors based on personal preference or political expediency, resulting in frequent changes in leadership and internal conflicts that ultimately contributed to their downfall.