 He issued many royal decrees and edicts that amended many of the previous Lê Dynasty's rigid and primitive policies, such as reforming the royal administration system, establishment of the national university for higher education, and division of the realm into 24 “lộ” or commanderies, in particular Hoan Châu and Ái Châu, to strengthen strategic military defenses.He also reformed the tax system by creating six tax classifications, which enabled the royal court to efficiently collect taxes and citizens to clearly know which tax classification affected them