@Andi **********
I applied pretty early on Friday (8am). I reckon if I applied on a Monday, would have been approved a bit faster, too. I was very thorough, Read every single approved/denied cases in Hanoi (figured it's one of the fastest), double checked everything during submission, and included literally everything I could think of. My list doesn't seem like a lot, but I added 2-3 examples on each.
Proof of employment - certificate from work that I've been working with them for 10 years + salary each month
Financial capacity - 3 months statement with balance more than required + certificate of deposit from another bank (I don't imagine the latter being very strong, but together they help further strengthen my case of financial capacity)
Proof of being in Vietnam - I left Thailand before my 60-day visa exemption, my stamp shows I can stay for 21 days + added Airbnb booking (not receipt even) which shows my VN address.
They didn't ask for proof where I'll be staying in Thailand (I added my previous Airbnb booking in Thailand)