TypeMate is running a special deal of 50% off on all of its font collection. It has a handful of fonts supporting Vietnamese. I had the pleasure of advising a few of them. I am eyeing on Kaius Text, designed by Lisa Fischbach. It supports Vietnamese as well, but I didn’t review the diacritics; therefore, I am not sure how they look. The deal ends tomorrow so I need to make a decision fast.