What are the number and names of countries part of Southeast Asia?

My teacher says there are 12 countries in Southeast Asia for a map that we have to do, but I only got 10?

What am I missing?

-Myanmar

-Thailand

-Laos

-Cambodia

-Vietnam

-Malasia

-Singapore

-Brunei

-Indonesia

-Philippines

I'm only sure of East Timor

East Timor and India

Taiwan, Hong Kong?