(BUG) Component don't recognonize Belarusian(also vietnamese) phone numbers

[Rubon72]

Steps to reproduce

1. go to https://louismazel.github.io/vue-phone-number-input/
2. take any vietnamese phone number https://www.bestrandoms.com/random-vn-phone-number
   ex vietnamese [phone]
   ex belarusian [phone]

Expected behavior

show belarusian(vietnamise) flag and countryCode should be right

Screenshots

Device

Windows 10, Chrome