To enter your residential address in Vietnam accurately:

For example: Go to Google and search for “Hanoi Vietnam” (replace Hanoi with your port of entry), then zoom in on Google Maps like in the image. After that, choose any hotel in Hanoi, and you will see its address.

In the image, the address is: 44 Hàng Trống, Hoàn Kiếm, Hà Nội

You can fill it in as follows:

Residential address in Viet Nam: 44 Hang Trong
Province/City: Ha Noi City
Ward / Commune: HOAN KIEM WARD

Please look at the image below to enter the information correctly.

Because you can enter Vietnam through any eligible port of entry, your residential address in Vietnam can be filled in with any location. Based on my experience, I recommend choosing Noi Bai International Airport as your port of entry and using a corresponding address in Hanoi, as shown in the image above.