I bet you'll take the offer :D
Departures are indispensable events in your life, especially when you have such a great opportunity like that. You can preserve your study at HUT by signing a form, go working for Google Singapore for one and half a year and get back and finish what you've done.
Singapore is not that far from Vietnam, now it takes you only 2 hrs to transfer between 2 nations. In addition, Vietnam working-environment is absolutely not as good as foreign ones for such talent guys like you.
What you have to do: Get ready, set, and go. Don't hesitate at such interferences like that.
Good luck.