I found out that he was in Yangmingshan, Taipei, with no specific address, and was awarded an honorary professor by China Hainan Normal University, Xiamen University and Jinan University.

No.306, Section 1, Dunhua South Road, Taipei

It is said that he can get it by writing "Taiwan Province Province-Li Ao".

I think you can just write Yangming Mountain in Taipei, and the post office will find out the specific address of Li Ao.