[NTG-context] ConTeXt & UTF-8 for Vietnamese

Hi all, I'm newbie of ConTeXt. I use VnTeX (vietnamese package for LaTeX of Han The Thanh) with UTF-8 without any problem on teTeX 2.x (with pdflatex). Now I would like to try ConTeXt and if it works I'll convert all my LaTeX src into ConTeXt later. Anyone could give me some links to read for this please. Thank you in advance Regards,