Online education has rapidly become popular worldwide in higher education. There are massive open online courses which could be found in Coursera and EDX. These courses ensure the availability and the accessibility of the online learning through videos with subtitles. Online learning not only gives students unprecedented opportunities to learn, but also reduces the cost of higher education. However, online learning presents unit challenges compared to traditional learning, especially in Vietnamese education. In this paper, we present the advantages and disadvantages of online learning. In particular, we will show the advantages and disadvantages of taking online courses of Vietnamese students. We will also share our experience as a tutor of Funix University which is the first online university in Vietnam. In addition, we will give feasible suggestions to improve the quality of online learning in Vietnamese universities, especially the quality of assessment in online learning. These suggestions could be applied in building new online courses in the universities.