Last time someone already told you. Vietnamese language now used the Roman alphabet. So the readers only need to know the Vietnamese names in the Roman letters. The Hán tự is now the most obsolete language, that it used the ugly Chinese charaters. Chinese is a dirty and grubby language. So only the readers who can speak Vietnamese would care about Hán tự, and the readers of other language never pay attention to Hán tự but the modern Vietnamese words when reading articles about Vietnamese history. But modern Vietnamese people also didn't care, can't read and write Hán tự anymore.