=ArrayFormula(Regexreplace(Regexreplace(Regexreplace(Regexreplace(Regexreplace(Regexreplace(Regexreplace(Lower(A1:A5);"[áàạảãăắằặẳẵâấầậẩẫ]";"a");"đ";"d");"[éèẹẻẽêếềệểễ]";"e");"[íìịỉĩ]";"i");"[óòọỏõôốồộổỗơớờợởỡ]";"o");"[úùụủũưứừựửữ]";"u");"[ýỳỵỷỹ]";"y"))
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