NewsOfficial letter of the Department of Labor, War Invalids and Social Affairs on ensuring the safety and prevention of Covid-19 epidemic for students and students returning to school after the holidays April 30, May 1 Posted on 4 May, 20211 September, 2021 by hdvtc 04 May CV 950 dam bao an phong chong dich COVID19 sau 30.4, 1.5 (2) hdvtc