This is the ValueSet that contains all the codes in Tuyến chuyên môn kỹ thuật lịch sử — Vietnam Legacy Technical Line ValueSet (http://fhir.hl7.org.vn/core/ValueSet/vn-legacy-technical-line-vs) and Tuyến chuyên môn kỹ thuật lịch sử — Vietnam Legacy Technical Line ValueSet (http://fhir.hl7.org.vn/core/ValueSet/vn-legacy-technical-line-vs). E.g. what you have to deal with if you get resources containing codes in either of them