Circular No. 17/2009/TT-BLDTBXH dated May 26, 2009 of the Ministry of Labor, War Invalids and Social Affairs amending, supplementing a number of points of Circular No.21/2003/TT-BLDTBXH dated September 22, 2003 guiding the implementation of a number of articles of Decree No.44/2003/ND-CP dated May 09, 2003 of the Government on labour contracts