This is the ValueSet that contains all the codes in Mã trả lời KSK — Có, Không, Không nhớ rõ (ValueSet VNKSKYesNoUnknownVS) (http://fhir.hl7.org.vn/core/ValueSet/vn-ksk-yes-no-unknown-vs) and Mã trả lời KSK — Có, Không, Không nhớ rõ (ValueSet VNKSKYesNoUnknownVS) (http://fhir.hl7.org.vn/core/ValueSet/vn-ksk-yes-no-unknown-vs). E.g. what you have to deal with if you get resources containing codes in either of them