The origin of Buddhism in Vietnam is deeply intertwined with a legend that blends both miraculous and realistic elements. This legend tells the story of Lady Man Nuong, who, under the guidance of Monk Khau Da La—a Buddhist monk who came from India during the early centuries of the Common Era—received the teachings of Buddhism. She later became known as the Buddha Mother in the region of Co Chau, located near the ancient Luy Lau citadel. This folk legend has been deeply ingrained in the collective memory of the Vietnamese people in the Red River Delta for generations. It was later elaborated upon by scholars, written into texts, and engraved onto stone tablets by monks for broader dissemination. A group of literary scholars at the Institute of Han-Nom Studies, led by Professor Nguyen Quang Hong, gathered these documents from Dâu Pagoda. After an extensive period of meticulous research, they compiled this book, "Di Văn Chùa Dâu: Cổ Châu lục - Cổ Châu hạnh - Cổ Châu nghi", to share with readers.