As I understand it the License is for the machine itself. Unless you make a significant hardware change the license remains valid no matter where in the world you move to.
There is one issue though that you may run into. The Windows Store.
You may need to add to your Windows Store settings a new region (i.e. USA), and this you will also need to change your Payment settings to a US based payment method.
This page from Microsoft was written for the Windows 8 and 8.1 users, but you might as well take a look as it explains how to change settings in the Store for such cases.
http://windows.microsoft.com/en-nz/windows-8/use-windows-store-country-region-help
Given you will now be in a new region some of the built in apps for news, weather etcetera will need you to change your Region and time settings to function correctly. I assume when you upgraded to Windows 10 your region settings were for Thailand. Again this ought not affect Windows 10, but if at some time you need to reinstall Windows 10
you may need to temporarily change Region settings back to Thailand. Obviously, I've not had to do this, hence the " may need to ".
Regards,
Regedit32