A Vietnamese phrase similar to “Hello?” or “Excuse me?” in British English. Can be said as a means of calling the attention of someone younger than you.
Anh and Ha sat in a restaurant

Ha: I’m starving. Where’s that waiter got to?
Anh: Let me check. Em oi!
Waiter: What do you want?
by You Know... That Guy September 28, 2021
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