What's your point? Not a single one of those vessels displaces more than 2000 tons. It's very much a short ranged coastal defense force and any SCS conflict is definitely "green water" at minimum.
None of those are survivable if they operate alone or far from air cover and you can bet China can easily achieve air superiority over Vietnam. And if Vietnam were to try to gather those vessels for some kind of concentrated attack against a high value Chinese target, since those corvettes lack area air defense or any significant asw capabilities (no helicopters), they'd be sitting ducks for Chinese aircraft and subs. Both of which China has in greater quantity and of vastly better quality than what Vietnam possesses.
Basically, you've shown a map of how a country with as large a coastline as Vietnam only has a banana boat navy. Good job. Ho Chi Minh would be proud of what Vietnam has become in the 21st century.