Unsupported languages in Postgres Full text search My web application supports 3 languages, English, Traditional Chinese, Vietnamese. I understand that Traditional Chinese and Vietnamese is not supported in Postgres' Full Text Search.

If I were to go ahead and implement Full Text Search, what will happen if a text search is performed using an unsupported language?
There are Postgres extensions to handle Chinese. Have you tried http://pgxn.org/dist/zhparser/? You can then maybe port it to Vietnamese.