1. Nguyen Trai and his Nôm poetry collection - Quốc âm Thi tập

Quốc âm Thi tập  (國音詩集) is a 14th-15th-century collection of Nôm poetry written by Nguyễn Trãi (1380- 1442) – the most famous poet of Vietnam. He was recognized as an international cultural celebrity by UNESCO in 1980. Nguyen Trai is counted as “the first man to construct Vietnamese Nôm literature” (Prof. Đào Duy Anh). Quốc âm Thi tập is not only the development of literature, but also the progress of Nôm script, the Vietnamese language, and Vietnamese culture. The Nôm text Quốc âm Thi tập is a cultural inheritance, because there are 12,500 Nôm characters from the 15th century in the text.

This poetic collection holds a significant place in the history of Vietnamese literature and culture. It is the most ancient Nôm poetry collection. It's considered the preeminent work of Vietnamese literature and may be compared to The Tale of Kieu by Nguyen Du.

2. The introduction of “A Dictionary of 15th Century Ancient Vietnamese”

a. Features

• Covers the 254 Nôm poems in the text Quốc âm Thi tập.
• The dictionary describes Nguyen Trai’s language in a way that can be compared to the Shakespeare Lexicon and Quotation Dictionary.
• Each entry of the dictionary contains Nôm characters from the original text.
• Dictionary of 15th century Vietnamese- with linguistic data which is 200 years older than the Dictionarium Annamiticum Lusitanum et Latinvm of Alexandro de Rhodes (printed in 1651, Rome), and 400 years older than The Tale of Kieu of Nguyen Du.
• The dictionary entries include: lexicon, literary allusions, idioms, proverbs, names of people, geographic names, etc., found in the text Quốc âm Thi tập.

b. Structure

• Explanatory Notes.
• Dictionary: 2,525 entries (with Nôm characters, etymology, reconstruction, ...).
• Index.
• Appendix: Interpretation and translation of 254 Nôm poems in the poetic collection Quốc âm Thi tập 
• References.