"17 million VND a month is surviving and not living. " I agree. What about emergencies? Just because Vietnamese can live on less, it will be huge culture shock for you. They are used to the heat, rats, shopping at markets everyday. How did you choose Vietnam? It is far from the easiest country to be an expat.
A partial answer from my short experience. I live in Saigon inner city, not the chic expat suburbs. And I really like it here!
Start with RetireCheap.Asia website and youtube channel. JC covers living in Thailand for under $1000. A lot of the info is applicable in Viet Nam, Cambodia, etc. There is a good $10 membership site too.
Another great resource are two US expats Reekay and Ned with youtube channels in Dumaguete, Philippines. There is not much expat info from Vietnam on youtube.
1. My studio apartment is very nice, but no kitchen! (I have a microwave + fridge = good enough for me), in a family-owned building, from an ad on Vietnamese language website, apt and all utilities including aircon electric is $340/month.
Aircon costs $50 - $75 a month in a small apartment if you use it every day. And you will.
Saigon is crowded and there is no place to grow food, no gardens. You have to live in a small town to see that much dirt in one place, cheaper there too.
Mushrooms? Dude you will have to really learn to love Vietnamese food on a small budget.
2. I just ran an internet speedtest. 17M down, 16M up. I don't have complaints about internet here, sometimes slow, like anywhere. There is wifi everywhere, even at the convenience store.
3. There are 2 public olympic size pools near me with swim lanes, 50.000 and 30.000 entrance fee.
4. Only trillionaires have cars. You probably can't get a license anyway, and good, then you won't kill anybody. Thailand has more cars, and I don't think a 100% duty on purchase price like here. Bus is only 25 cents. Or how about a 3-wheel motorbike? Guess US$3000.
5. Substitutes for most name brand meds are available w/o prescription. Internet search.
6. You won't be able to communicate with translation apps. You have to learn how to pronounce Vietnamese first. There are many new sounds. Plan on spending a lot of time. Start now! An advantage of city living is some (young) people speak a little English. You will have to depend on your new girlfriend.
7. Visas - search this forum for a thousand threads.
Before you get too serious about moving here, you need to visit for 2 - 4 weeks. Stay in 5 different cheap hotels in different places. It is not for everybody.
Crazy suggestion: find a woman who works, then you will have more money together. Unless she has kids, then much less. You can live with her family, she will be living with them already.
And I wouldn't say it is a paradise for meeting women. Why do men think that? Language barriers. Culture barriers. Traditionally shy and expecting men to lead, she will not approach you. Sex after marriage. Older men/younger women connections easier and more accepted in Philippines, Thailand.