This is the CodeSystem that contains all the codes in LOINC Việt Nam — Vietnam LOINC CodeSystem (http://fhir.hl7.org.vn/core/CodeSystem/vn-loinc-cs) and LOINC Việt Nam — Vietnam LOINC CodeSystem (http://fhir.hl7.org.vn/core/CodeSystem/vn-loinc-cs). E.g. what you have to deal with if you get resources containing codes in either of them