tự
oneself
Typed without accents: tu
Meaning
Highlighted words are what Saigon and Hà Nội say differently.
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oneself
adverb(by) oneself, on one's own, yourself
Before the verb: tự làm, do it yourself. Tự học is 'teach yourself'.
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Saigon
Hà Nội
You taught yourself Vietnamese?