In general, a Native English speaker is most preferred. A four- year college degree in any subject is required for a would-be English teacher in Vietnam and a teaching certificate is preferred. However, it doesn’t mean that you could not get a good job without such certificates but surely those documents will guarantee your chances of landing a better job and getting a Work Permit in Vietnam. TEFL, CELTA, TESOL courses can be found easily in both Ha Noi and Ho Chi Minh city. It cost about 1000$ a course. Some schools require a teaching certificate, and can be strict about it, but others are more relaxed. A CELTA or a TESOL certificate can get you a slightly higher salary. For long term, we recommend you to join and get one. Knowing Vietnamese is not a requirement but it helps you easily intergrate into your classroom and sometimes impresses your students.
With some English Language centers, the only real requirement for a teacher is that you are Westerner, speaking English fluently and can make their students happy. So your experiene of teaching becomes an important qualification.
Native English speakers of Vietnamese descent, even those with all qualifications and training, may find it harder to find a teaching job, and he/she may have to accept lower pay. Bosses have been known to advise their employees. I heard my boss told an overseas- Vietnamese English teacher, called David: “Please don’t speak Vietnamese in your class. Don’t let students or specially parents know that you speak any Vietnamese.”
To find more information, visit http://teachinvietnam.org