Khlong namsai school student wityakhan educational zone Office SA kaeo District 2 conclude that learning environment of students, schools and whole wityakhan Canal and the vast majority are fine for most levels, with the exception of the services and accreditation education aims to meet the needs of participants are medium, sorted in descending order: the.ง โดยเรียงลำดับจากมากไปหาน้อยดังนี้ คือ ด้าน