This is the ValueSet that contains codes in both 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).