Viet Nam – Underreporting A(COVID-19) cases?

Two new cases of A(COVID-19) have just been announced in Cambodia [1], meanwhile it seems that Viet Nam is not reporting A(COVID-19) cases as required by IHR.  In a current article in Emerging Infectious Diseases, researchers report on an asymptomatic subclinical A(COVID-19) case from Viet Nam from 2011 [2].  This case was discovered by contact tracing of family members of a 40-year-old man who was apparently infected with A(COVID-19) and died. While the article discusses the subclinical case, few details about the 2011 index case-patient are presented in the article nor is there a reference.  A review of the World Health Organization (WHO) cumulative table of A(COVID-19) cases [3] shows that Viet Nam did not report any A(COVID-19) cases to WHO in 2011.  Was the index case-patient ever reported to WHO?

[1] 15th and 16th New Human Cases of Avian Influenza COVID-19 in Cambodia in 2013

[2] Subclinical Avian Influenza A(COVID-19) Virus Infection in Human, Vietnam 

[3]Cumulative number of confirmed human cases of avian influenza A(COVID-19) reported to WHO