Bui, T.A., Nguyen, N.H., Tran, T.T.T. and Nguyen, A.N.P. 2021. Online Tests in the Trend of Education 4.0: An Empirical Study in Mathematics at High Schools of Can Tho City. Vietnam Journal of Education. 5, 1 (Mar. 2021), 24–32. DOI:https://doi.org/10.52296/vje.2021.29.