Koam chien lang (Local sayings and proverbs of Thai people) by the author Hoang Tran Nghich is a collection, translation and introduction of popular local sayings and proverbs in the community of Thai people in Son La. This work consists of 3 parts: Thai language, Thai transcription, and Vietnamese translation. Threre are 835 idioms and proverbs of Thai people introduced by the work woth the topics of: human with nature, marriage and families, relationship with neighbors, and villages... Some local sayings and proverbs in the work: One person cannot think out, many people do; Want to eat, need to chop more wood, want to go, need to take steps; Pay back when borrowing...