Wikipedia has an explainer called "Verifiability, Not Truth". It was quite popular to reference this during disputes.
https://en.wikipedia.org/wiki/Wikipedia:Verifiability,_not_t...
It was deprecated to "essay" status a while ago, because it was quite controversial, but not because it was inaccurate.
Wikipedia is not involved in the business of publishing Truth. Wikipedia's articles are based on Verifiability, which means that the assertions can be backed up and traced to the reliable sources that are provided alongside them.
If there is a dichotomy or controversy about the "truth" of a fact, well, then, Wikipedia documents that controversy, according to the reliably-published information about it.
Wikipedia projects work within the languages they're published in, for better or worse. That means, a Vietnamese wiki will generally be run by and for people who speak Vietnamese, and will generally rely on sources published in that language. So if there is a consensus about a fact or assertion in Vietnamese-language sources, and it's agreed by people who speak Vietnamese, then it wouldn't be easy to break through that consensus, even if you had a sincerely held belief.
Which brings us to another Wikipedian axiom: WP:RGW.
https://en.wikipedia.org/wiki/Wikipedia:Tendentious_editing#...
People who edit Wikipedia shouldn't be concerned about "Righting Great Wrongs" through editing or discussion. If there is injustice in the world, it will likely be reflected in Wikipedia, despite striving to be a collegial utopia, it is not usually possible to change the world from activism there, and activist editors are eventually blocked and banned for being non-neutral.