http://stackoverflow.com/questions/2213541/vietnamese-character-in-net-console-application-utf-8
 
class Program
{
    [DllImport("kernel32.dll")]
    static extern bool SetConsoleOutputCP(uint wCodePageID);
 
    static void Main(string[] args)
    {
        SetConsoleOutputCP(65001);
        Console.OutputEncoding = Encoding.UTF8;
        Console.WriteLine("tést, тест, τεστ, ←↑→↓∏∑√∞①②③④, Bài viết chọn lọc");
        Console.ReadLine();
    }
}