Can I use my permanent green card and Vietnamese passport to travel to Canada?

After I travel can I use the Vietnamese passport and US green card to return back US.

Answer:
You can use your passport to enter Canada and your green card to enter the US. If your a Permenant Resident Alien, then your green card is your passport to enter the US.

Is it lawful for a working visa holder in USA to take a short visa to one's home country?

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