@Traian *******
sure. You need application form ،which i download it online، need a photo to attach to the application form. A copy of your passport. Your accommodation booking in hanoi if you are coming to hanoi. Your address in Thailand. Most importantly the last six months of your bank statement with the minimum of 500k ،i did get the prof of balance as well. They didn't ask for ticket to or out of Thailand i left it blank. On the section of the flight number i check the flight to Chiangmai and wrote the flight number. I did sign all the pages. When i submit my application i did ask how long it takes as i need to book my ticket back to Thailand، and she said i suggest don't book your ticket until your visa is ready، so i just book my ticket today after i picked up my visa.
Good luck .