System font for Chinese, Thai, English courses

Hi guys, i am trying to gather info on fonts to use for our template. We translate or English courses into both traditional and simplified Chinese, Thai and Vietnamese, and wanted to know the best system font to use (mainly Windows, but soon to be moving to tablets as well). We currently use Verdana, but i recently was told that Tahoma is a better option.


Can anyone confirm that this is the case, or a better alternative?


Thanks

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