The Vietnamese have not had a coast guard very long, just two years, but it looks like after a recent visit by our Commandant, the US Coast Guard will be working more closely with them. The US had already committed to financing the purchase of US made patrol boats for the Vietnamese Coast Guard to the tune of $18M. We discussed this earlier here and here.
As you probably know, the Vietnamese and Chinese have an ongoing dispute over a large area of the South China Sea. A recent change has authorized the their Coast Guard to use force as necessary to expel those who violate law from Vietnamese waters.
Chuck Hill's CG Blog 
Looks like the USCG will be looking to the AUX Interpreter corp for Vietnamese speaking aux members to travel with the USCG to Vietnam.
Japan is also making donations to Vietnam’s Coast Guard. http://www.marinelink.com/news/delivers-vietnam-ships400370.aspx
and there is this. “The Japanese ships follow a U.S. pledge to provide at least five refurbished fast patrol ships to improve Vietnam’s Coast Guard.”
Political Changes in Vietnam make it less likely they will be confrontational with the Chinese over the 9-Dash Line claims but likely they will continue to work with the US. http://cimsec.org/21720-2/21720
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The Japanese are also helping Vietnam. Two large ships and five used aircraft. http://www.marinelink.com/news/provide-vietnam-patrol415074.aspx
6 Metal Shark 45 foot patrol boats (response boat, mediums) delivered to Vietnam. https://www.marinelink.com/news/delivered-vietnam-patrol425698
SecDef visits Vietnam second time in a year. https://www.militarytimes.com/news/your-military/2018/10/14/mattis-pushes-closer-ties-to-vietnam-amid-tension-with-china/
Vietnam objects to China building potential Military installation in Vietnam’s EEZ. https://news.abs-cbn.com/overseas/11/23/18/vietnam-protests-new-building-by-beijing-in-south-china-sea?fbclid=IwAR0ObJI45FVCef4XwLYpa7p3dR0eO1rtZQSz94Fn0c9-ngFeoZCuT3HnCzs
US donates six 14 meter Metal Shark patrol boats to Vietnam Coast Guard.
https://www.bairdmaritime.com/work-boat-world/maritime-security-world/5043-us-donates-six-patrol-boats-to-vietnam-coast-guard