Learner autonomy has become the prevailing theme of language education for nearly four past decades, especially its three constructs such as responsibilities, abilities and behaviors. Thus, the current study embraced salient traits of a survey research design to scrutinize these constructs as appraised by the Vietnamese tertiary learners. The study recruited the participation of 80 English-majored students at Hung Vuong University, Vietnam. Their appraisal was elucidated by a quantitative instrument, that is, a 28-item questionnaire whose descriptive statistics were yielded by SPSS 22.0. The study found that a greater proportion of the informants ultimately recognized their autonomous responsibilities, acknowledged their autonomous abilities, and estimated some autonomous behaviors both inside and outside the classroom. Brief conclusion was made at the end of the paper.