KHOA ĐẨU WAS THE FIRST VIETNAMESE ANCIENT LANGUAGE & WRITING SYSTEM THAT EXISTED THOUSANDS YEARS AGO DURING THE HONG-BANG (Hùng Vương) DYNASTY THAT BEFORE THE VIETNAMESE - CHINESE HAN( chử Hán-Việt) & THE VIETNAMESE NOM (chử Nôm) LANGUAGE & WRITING SYSTEMS...