@fat.tuy: The 'S' in Laos is NOT silent, even in the French language. If you write it with the S you have to say the S. But in the Lao language it is just "Lao" (no S). Here is an old video of the last (final) prime minister of the Kingdom of Laos, Prince Souvanna Phouma. Full video: https://youtu.be/HPrcv4Qtm6k