Tightening advertising activities in Vietnam, tightening the cross-border supply of online advertising services in Vietnam, Cross-border Advertising Decree in Vietnam, Decree 70/2021/ND-CP regarding the cross-border supply of online advertising services in Vietnam, Principles and obligations of foreign organisations and individuals trading in cross-border advertising services in Vietnam, New regulations specified in Article 13 of Decree 70, New points of Decree 70/2021/ND-CP, New points of Law on Advertising in Vietnam, advertising activities on Youtube in Vietnam, advertising activities on facebook in Vietnam