I would only look into South Korea and New Zealand to make a fair assessment of covid deaths. Both countries have mass testing and don't have the political pressure to under report any deaths. Both countries indicate with high vaccination rate, the percentage of death from infection is 0.13%. Any countries that have much lower death rate than these two countries either have relative young population like Cambodia or higher vaccination rate like UAE.
Vietnam doesn't have much higher vaccination than South Korea and only a slightly lower median age. However, I won't dismiss Vietnam data totally. Vietnam has two big waves of delta covid surge before the Omicron wave. For the two delta waves which resulted in 40,000 deaths from Aug to Feb, these two waves of delta and the subsequent Omicron wave(from early Feb to late March) didn't give Vietnam much of a break. So damages from Omicron were not as bad as other countries, but Vietnam still has a few thousands death due to Omicron wave.