mở rộng quan hệ buôn bán với nước ngoài to expand commercial relations with foreign countries
buôn gian bán lận to cheat in commerce
buôn dân bán nước, bán nước buôn dân to sell one's country down the river, to betray one's country, to be a traitor to one's people and country, to sell the pass
buôn phấn bán son, buôn phấn bán hương to be a prostitute, to be a brothel-keeper
buôn thần bán thánh to go in for religion-mongering
buôn thúng bán mẹt, buôn thúng bán bưng to be a petty trader