Ke Buoi, Yen Thai, Trich Sai are places in the ancient land located in the northwest of Hanoi capital.In the past, there were many craft villages in the ancient Buoi region, in which there were two famous handicrafts: weaving (Bai An, Trich Sai villages) and making Do paper (Ho Khau, Yen Thai villages). At present, the once famous craft villages only exist in the memory of the village elders and the remaining historical sites. Life has changed but the traditional historical and cultural values are still here. Present in the old houses, the village gates, the historical and cultural relics are still preserved by generations of people as the remaining unique features of the land near the ancient Thang Long citadel.