ary ▁Party ▁he ▁co - ed ited , ▁translated , ▁compiled ▁several ▁works ▁under ▁the ▁party ' s ▁publishing ▁organ ▁: vi : Qu an ▁h ả i ▁t ù ng ▁th ư . ▁It ▁compr ised ▁works ▁such ▁as ▁the ▁A . B . C . ▁of ▁Marx ' s ▁Do ctrine ▁(" A . B . C ▁Ch ủ ▁ng h ĩ a ▁M ác "), ▁New ▁Dem ocracy ▁(" D ân ▁ch ủ ▁m ớ i "); ▁transl ations ▁of ▁works ▁such ▁as ▁Social ▁Ess ays ▁(" X ã ▁h ộ i ▁lu ậ n "), ▁A ▁History ▁of ▁economic ▁teach ings ▁(" L ư ợ c ▁s <0xE1> <0xBB> <0xAD> ▁c ác ▁h ọ c ▁th uy ế t ▁kin h ▁t ế ") ▁or ▁The ▁Commun ist ▁Man if esto ▁(" T uy ên ▁ng ô n ▁ Đ ả ng ▁C ộ ng ▁s ả n "). ▁ ▁At ▁the ▁end ▁of ▁ 1 9 2 8 , ▁Ph an ▁ Đ ă ng ▁L ư u ▁and ▁H à ▁H uy ▁T ậ p ▁were ▁sent ▁to ▁Gu ang z hou , ▁China , ▁in ▁order ▁to ▁eng age ▁the ▁Vietnam ▁Revolution ary ▁Youth ▁League ▁into ▁a ▁common ▁struggle ▁for ▁liber ation ▁and ▁independence . ▁He ▁returned ▁after ▁ 5   month s ▁as ▁the ▁Vietnam ▁Revolution ary ▁Youth ▁League ▁went ▁into ▁hiding ▁and ▁contact ▁could ▁not ▁be ▁established . ▁In ▁September ▁ 1 9 2 9 , ▁Ph an ▁ Đ ă ng ▁L ư