You've done well for a newcomer to satellite television in successfully finding another satellite and loading channels as you have described. Congratulations!
The encryption system in use is SkyPilot, not SkyPoint. This might explain your lack of success in finding information.
I'm not aware of more fta (free-to-air) Vietnamese channels other than on C-band (as you have already discovered).
If you haven't already done so, a quick SEARCH of these forums (using the SEARCH button at top of page), will reveal that there is some information in the thread at , which might help to answer other questions you have asked.
Note that the channels on 12402,V are transmitted in a High Definition S2 format, therefore an High Definition DVB S2 satellite receiver is necessary to resolve them.