I come from Vietnam and I real hope that my language would be supported at blogger soon. The information technology of Vietnam has been grown rapidly, more and more Vietnamese have internet connection and start to explore the world through it. Especially, Vietnamese youth today have a real "internet life" with their blogs. I think Vietnamese is a potential market for Blogger.
This won't happen immediately, though. Jehovah's Witnesses currently identifies 310 languages worldwide, and they have been doing their work for hundreds of years.
Blogger won't be providing its service in 310 languages simultaneously. As they add new languages, one by one, you'll have to expect that some languages, worthy though they be, will have to wait.
Be patient, your language will be ready one day. Feel free to let Blogger know how important your language is, but don't get your hopes up too high.