Vietnamese poetry has a long-standing tradition, and discussions about poetry have existed since ancient times. Many books on Vietnamese poetry have been published since the early 20th century. However, when it comes to the theory of poetics at the phonetic level, this can be considered the first work of its kind, as previous works mostly described poetic rules based on traditional experience. This is a monograph that the authors have long cherished and practiced in teaching for 40 years, and now have the opportunity to present in the form of a book. Following this approach, the book is divided into three parts: (1) Vietnamese Poetic Language: Necessary Perspectives (the first three chapters), which presents the basic theories of the book; (2) Vietnamese Poetic Language: Basic Forms (seven chapters), which explores the poetic rules of Vietnamese poetry through detailed descriptions of its main poetic forms; and (3) Vietnamese Poetic Language: Aesthetic Aspects (the last three chapters), which focuses on "poetic aesthetics" and offers a theoretical and specific analysis of the aesthetic aspects of Vietnamese poetic tones.