In today's digital age, there are many good digital techniques and tools for studying history, among which, text mining techniques are prominent. Text mining is approached using a variety of techniques and software, of which the Atlas.ti application, a German software, is widely used thanks to its flexibility and open access. This article presents the research on Khu Tru Mat Vi Thanh - Hoa Luu, a strategic area in the Mekong Delta Region of Vietnam from year 1960 to year 1963, through the exploitation of national archival documents by Atlas.ti software. The research results not only provide important historical documents on the changing economic face of the rural areas Vi Thanh - Hoa Luu, but also serve as an important basis for the orientation of socio-economic development in Mekong Delta Region of Vietnam today.