Steam change country region

You may also need a payment method issued there, not sure.

When you purchase something from a country, your steam store ties to it, doesn't change.

Nope, if you log on from another country, your location turns into a drop-down bar.

He said: .i want to ask if i back to vietnam I can keep the region singapore.

"If you have moved to a new country, or are living abroad for an extended period of time, you can update your Steam country setting."

You're not allowed to change it if you just temporary travel and it may lead bans if you do so, and use it to get games cheaper.