I want to ask a girlfriend who went to Vietnam on National Day. She didn't return my phone calls and text messages to QQ, and WeChat sent them to me.

I think you should first consider what went wrong before he didn't go, and then go to her best friend to consult what's abnormal recently and send her a message. If you don't reply, I think you should call the police first to avoid any accident, not to mention a woman, and then ask her parents.