There's an easy wayto set it asdefault, so youdon't have toswitch back and forthevery timeyou want to use
Step 1 . Go to Settings on your iPhone or iPad.
Step 2 . Tap on General Settings
Step 3. Select Keyboard
Step 4 . In the new window, continue to select Keyboard
Step 5 . Tap on Edit
Choose your default keyboard for your iPhone. You can select English, Vietnamese to use (You can tap on them and move up - down to replace each other, the top position will be chosen as default.
Step 8 . Once done, tap Done to complete.
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After following this guide on your iOS 8 device, you'll no longer feel bored with the old keyboard, instead, you'll find the new keyboard more exciting and can be used in all text input programs.