Vietnamese Dictionary plugin for Multiling O Keyboard autocorrect and word prediction. Instruction: ⑴ Install this plugin and Multiling O Keyboard. ⑵ Run O Keyboard and follow its setup guide. ⑶ Slide space bar to switch languages. If you have font issue, read this: Wikipedia: Vietnamese Listeni/ˌviɛtnəˈmiːz/ is the national and official language of Vietnam.