If you qualify as a foreigner, you can deposit money into a "Cash Deposit" account or a "Time-Savings" account. Essentially agreeing to keep your money in for a set amount of time.
I found the interest rates of the nation's three largest banks and listed them here for you (aren't I such a nice guy?):
Agribank
- note you'll have to select "View savings interest rates" under the FORMS, FEES AND INTEREST RATES box on the right side
http://agribank.com.vn/62/977/individua … vings.aspx
Vietin Bank
- right side is "interest rates in VND" box
http://www.vietinbank.vn/web/home/en/index.html
Vietcom Bank
http://www.vietcombank.com.vn/InterestRates/?lang=en
Since you're asking about financial advice from total strangers, then you'll get advice that goes...."here's what I'd do":
Don't deposit what you can theoretically lose if the banking system collapses. Of the amount you would invest, split them in multiple segments to be deposited in different banks. Of the amount you deposit in each bank, divide them up so that you'll always have access to a percentage of your money. Here's the example. I'm assuming all interest rates remain the same in this scenario to illustrate how to "ladder" your investments.
100 million VND to be deposited.
33 million VND to go in Agribank
33 million VND to go in Vietin
33 million VND to go in Vietcom
Agribank (select 3 month at 7% for optimization)
1) 11 million VND starting January (or month #1 of your plan), matures in April
2) 11 million VND for 1 month deposit at 6%, matures in February at which time you deposit in the 3 month at 7%, matures in May
3) 11 million VND for 2 month deposit at 6.5%, matures in March at which time you deposit in a 3 month at 7%, matures in June
after the 1st block matures, redo it for another 3 months...or do nothing and the bank will automatically roll it into another 3 month (you should verify with bank if they do this), so it matures in July
So every month, you have at least 1 group matures; at which time you can go in and withdraw the interest rate or plow it back in for compounding effect...i.e 11 million X .07 per year / 12months per year X 3 months = 192,500 VND (the bank actually uses a interest rate formula but it should come close to my simple math straight interest calculation).
You can do the same with the other two banks...using a separate strategy for a 2 month block or 6 month block. Or you can just drop the whole enchilada into a 12 year time frame for a larger percentage rate.