Well I bought usd from local shops that exchange currency in india by giving them air ticket and e visa
The hotel in Hanoi, in old quarters,, were giving better rate so exchanged with them
ATM has limit of around 2000K to 5000k depending upon the bank. ATM at Citi Bank was having higher limit.
Charges are not much in Hanoi, though I don't remember it. I will be going to hanoi in June, this time will keep track of it
What were the charges of ATM withdrawal in Bangkok?