Why I have been charge 179,000vnđ for Apple bill?

You are not speaking to Apple, this is a user to user community. 

We are unable to help with refunds, account issues or purchases  

Cancel/see your subscriptions here - See or cancel your subscriptions - Apple Support 

Try applying for a refund here - Request a refund for apps or content that you bought from Apple – Apple Support

Or Contact Apple Support - Contact - Official Apple Support

Phuong,

Did you really get charged, or was it just an email trying to scare you? Look in here:

http://www.apple.com/legal/more-resources/phishing/