“Research on Chữ Nôm and Vietnamese through the Translations of Khoá hư lục” by Associate Professor Trần Trọng Dương is a scholarly monograph revised and expanded from his doctoral dissertation in Hán Nôm Studies, defended in 2011. The book centers on Khoá hư lục, a seminal work of medieval Vietnamese literature and thought, to shed light on the formation and development of Chữ Nôm as well as the history of the Vietnamese language. The content is structured into three main parts: (1) an examination of the translator and the text through linguistic and scriptural evidence, with particular emphasis on determining the time when Zen master Tuệ Tĩnh completed his explanatory translation of Khoá hư lục; (2) a study of Chữ Nôm in Thiền tông khoá hư ngữ lục and Khoá hư quốc âm, using methods of statistical analysis, comparison, and classification of character structures to highlight their evolution; (3) a study of Vietnamese through these two translations, focusing on archaic vocabulary and function words, with statistical data illustrating lexical differences and clarifying the distinction between “phonetic annotation” (giải âm) and “semantic annotation” (giải nghĩa). With its systematic and meticulous approach, the book makes significant contributions to historical linguistics and Hán Nôm studies, while also providing valuable insights into the localization and development of the Vietnamese language within the broader context of medieval cultural and intellectual history.