If you have a htaccess file you could try adding this
Code:
<Files *>
order deny,allow
# Vietnam (VN)
deny from 1.52.112.0/20 42.112.0.0/13 58.186.0.0/16 58.187.96.0/20 58.187.112.0/20 112.78.0.0/20 112.197.0.0/16 112.213.80.0/20 113.22.0.0/16 113.23.0.0/17 113.160.0.0/11 115.72.0.0/13 115.84.176.0/22 116.96.0.0/12 117.0.0.0/13 118.68.0.0/14 123.16.0.0/12 125.234.0.0/15 171.224.0.0/11 175.100.64.0/20 183.81.0.0/17 183.91.0.0/19 202.78.227.0/24 203.113.128.0/18 203.162.0.0/16 203.210.192.0/18 210.211.96.0/19 210.245.80.0/21 220.231.124.0/22 222.252.0.0/14
</Files>