Hai Thuong Lan Ong is the nickname of Le Huu Trac (1720 - 1791). Although he was adept at medicine, ancient oriental philosophy, literature, he was better known as a Oriental medicine physician. He is one of the two greatest oriental medicine physicians in the thousands-year history of the Vietnamese nation, along with the famous physician Tue Tinh. He has made outstanding contributions to the development of traditional medicine. This book was written by Hai Thuong Lan Ong in the 80s of the eighteenth century (1781) - it was a troubled period of the Le - Trinh feudal court. He recounted the journey from his hometown Nghe Tinh to the capital of Thang Long to cure Trinh Lord at the palace. He recounted the time he lived in the capital of Thang Long with so many fluctuations, describing his association with the nobles and mandarins of the Le Dynasty; and his confidences always hope to escape from fame and fortune to return home.