We have older maps to support China claims. Why do you use Chinese to write on the map? You indicate the time when vn was still part of China???
What do you think ?
There is old map of Vietnam stating clearly with Chinese characters (Vietnamese used chinese to writing in the past like Japanese do it until now)
黃 沙 = Hoàng Sa
萭 里 長 沙 = Vạn Lí Trường Sa
There are the names in Vietnamese of Islands belong to Vietnam Paracel and Spratly in English .