Facing problems to servers in the SEA region? Well, it's nothing to do with the Dota 2 servers specifically. One of the under water cable systems in the Asia-Pacific region has been damaged and many ISP's have been affected by it. Some work, some don't.
The ACPN is already at work and they hope to finish fixing stuff by mid-April. The connections have been routed to some international systems for the time period but this might cause bad network and connection issues to some local servers.
Unfortunately, there is very little that can be done otherwise until then. Your best alternative would be to find a connection that is fully functional through this period.
I'll keep ya updated.