This book is a collection of articles by famous Vietnamese scholar - Nguyen Dinh Dau, which has been published in newspapers and magazines for over 40 years. From an ancient map collector and history-geography fanatic, through enthusiastic articles and research, Nguyen Dinh Dau, 100 years old, has become a reputable scholar not only in Vietnam but also internationally recognized and supported. As a Vietnamese citizen, he was fortunate to witness almost all the most important moments of the nation's history in the 20th century. Nguyen Dinh Dau's work has now become important documents for comparison, reference and really useful to everyone. A special highlight in volume 3 of this series is the article, a very scientific analysis of the place name Saigon and the series of sovereignty of Vietnam on the Hoang Sa (Paracel) and Truong Sa (Spratly) Islands, or the article about the origin of the Cochinchina place that many Vietnamese as well as foreigners are still confused.