Under the provisions of Clause 31, Article 1 of Decision No. 505/QD-BHXH dated March 27, 2020 amending and supplementing a number of articles on procedures for collection of social insurance contributions and premiums of health insurance, unemployment insurance, occupational accident and occupational disease insurance; management of social insurance books and health insurance cards issued together with the Decision No. 595/QD-BHXH dated April 14th, 2017 of the General Director of Vietnam Social Security, the re-issuance of social insurance books due to the merge of the social insurance books needs these following dossiers: Declaration of participation, adjustment of information of social insurance and health insurance (Form TK1-TS); requested-to-be-merged social insurance books (if any) are submitted to the units where you are working or to the social insurance agency for consideration and settlement.