English is just the important key to communicate with the outside world Especially, for a developing country like Vietnam. English is taught very early as well as many young people are aware of the importance of English for reasons such as finding a high-quality work, communicating with the outside world, accessing to scientific resources which they are pursuing. This is the reason why currently many universities and colleges carry out teaching subjects in English as well as prescribe the foreign language learning outcome (commonly English) for the graduate students.