Click right mouse at computer corner. Select Network and Sharing Center

Select Manage network connections

Double click on Local Area Connection

Press Details

Check DNS Server of IP(IPv4 or IPv6). Press close

Press Properties

Double click on IPv4 or IPv6 of your DNS Server

Select use the following DNS server addresses:
fill in as follows
If you use the internet of TOT, you have to setup it as follows
203.113.127.199
203.113.24.199
If you use the internet of TT&T, you have to setup it as follows
202.69.137.137
202.69.137.138
If you use the internet of CAT, you have to setup it as follows
203.113.127.199
203.113.24.199

Press OK
You can normally access to the internet
Note This setup DNS server will use only TOT