ahh yea good point i was thinking from neighboring countries... my bad We flat out dont support applications in Taiwan, Singapore, Malaysia and Hong Kong. They behave you are applying for the job as ambassador lol
Its just Vietnam that asks for this as far as we can see. They will usually have a further information request asking you to demonstrate how you will support yourself financially. A cover letter explaining your financial circumstances is usually accepted though.
We have done about 100 in Vietnam, both embassys seem to have the same policy's and timeliness. They are not difficult embassys to deal with and if they request further documents its usually reasonable and achievable.