APAX English | 2,789 followers on LinkedIn. APAX English is the largest ESL school in Vietnam. Start your TEFL career now. #teachenglish #travelasia #teachapax | APAX English launched in Vietnam in May 2015 and has been continuously expanding ever since. Our bold, innovative curriculum and high standards for class quality have raised the bar of English education in Vietnam. Our curriculum and program began in Korea, as April English, back in 2007.