This book is a collection of important articles by Professor Nguyễn Quang Hồng on linguistics, grammatology, and philology over the past 40 years, carefully selected and refined. The monograph is divided into two major sections: (1) Linguistics and Vietnamese Language Studies and (2) Philology and Hán-Nôm Studies The monograph addresses many significant issues in linguistics, such as distinguishing language types, standardizing Vietnamese pronunciation, analyzing syllable structure, and studying the Nôm script, among others. Not only does this work summarize and cover the key research areas of Professor Nguyễn Quang Hồng, but it also serves as a foundation for future interdisciplinary studies, encouraging the exploration of new questions and further development in the field.