What are the financial requirements and application process for the DTV visa in Vietnam for expats?

Hello,

I am planning to apply for the DTV (Expats type) in Vietnam and am currently preparing my bank account to meet the financial requirement.

Previously, I applied through an agent in Laos, but the documents submitted were not strong enough, so I had to cancel the application. Since then, I have been preparing stronger documents and this time I would like to apply on my own.

I have a few questions:

1. For the financial requirement of 500,000 baht, does the full amount need to be in my account for the last three months, or is it acceptable if the amount has accumulated over time?

2. Since I cancelled my application in Laos, can I reapply in the same country with improved documents, or would I need to apply in another country? Is Vietnam a good choice?

Thank you very much in advance.