I tried applying for a relative. Here's my experience. New link very easy to navigate (though a bit slow): https://dichvucong.bocongan.gov.vn/boco … matt=26277
It does allow multiple entry for $50. The problem is that visa usage validity is only for 90 days. At least the date field that you have to submit for multiple cannot exceed 90 days. I was hoping for 1-year multiple entry.
After filling out the form. Received a confirmation email. Problem! The online payment link didn't work. Hopefully it will be working soon. I have three days to pay.