According to family documents, Thi was captured and imprisoned by the communist Viet Minh of Ho Chi Minh for three months at the end of the war in 1945 as they declared independence during the August Revolution.
Menurut catatan keluarga, Thi ditangkap dan dipenjara oleh Viet Minh komunis dari Ho Chi Minh selama tiga bulan pada akhir perang tahun 1945 saat mereka mendeklarasikan kemerdekaan selama Revolusi Agustus.