Perfect

hoàn hảo

(without fault or mistake)

hoàn mĩ

(excellent and delightful in all respects)

hoàn thành

(grammar: of a tense or verb form: representing a completed action)

hoàn toàn

(fitting its definition precisely)

đúng

(music: interval or any compound interval of a unison, octave, or fourths and fifths that are not tritones.)