Please go to this website.
Firm Foundations - Creation to Christ Books and Downloads in Vietnamese
http://firmfoundationslanguages.com
https://biblestudy.ethnos360.org
Please put the word Vietnamese in the search engine.
Firm Foundations is a Bible study series based on a unique missionary proven method centered on God's progressive revelation of His character and redemption plan...from Creation to Christ. This includes a study for adults and children. Tamil and Vietnamese. On the website, please look for the title "Creation to Christ".