With more than 500,000 Vietnamese-Americans living in California (About 2/3 living in either San Jose or Garden Grove/Wesminster), there is a growing interest in the Vietnamese-American communities in California of perserving the Vietnamese culture and tradition for the next generation of Vietnamese-Americans born in the US.
In a recent story NPR in southern Cal, CSU in Fullerton will launch a BA degree for Vietnamese language and culture, as well as teaching Vietnamese to teachers as foreign language.
http://www.scpr.org/blogs/education/2013/07/19/14303/university-to-offer-vietnamese-language-ba-and-tea/
As the 10th most speaking language in the world, Vietnamese is being used widely outside of Vietnam in Viet diasporic communities throughout the world. Besides the Western nations, travelers could hear Vietnamese language in far away countries like Somalia, Bangeldesh, and Egypt.