“The Origin and Formation of Hán-Việt Pronunciations” is a major scholarly work by Professor Nguyễn Tài Cẩn, one of Vietnam’s leading historical linguists. The book provides an in-depth study of the development of Sino-Vietnamese readings—a unique linguistic phenomenon that reflects the long-standing interaction between Vietnamese and Chinese. The author analyzes the origins, transformations, and phonological rules that shaped these readings, thereby shedding light on the mechanisms through which Chinese vocabulary was adopted and localized in Vietnamese. With rigorous and meticulous scholarship, the book offers a solid theoretical foundation for those interested in Hán Nôm, historical linguistics, and Vietnamese culture. Since its first publication in 1979 and through subsequent reprints, this work has remained an indispensable reference for researchers. Beyond its academic value, it also affirms the linguistic identity and literary heritage of Vietnam throughout history.