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Foreign trade in Dang ngoai (the North) and the relationship between Vietnam (Annam) and Japan in the 17th century

On the development of the canal system in Vietnam (From the 10th century to the first half of the 19th century)

Studies on some problems in the village's custom laws (in Lap Thach district-Van Phuc province) during the French colonial period

The Dutch East Indian Company (Vereenigde Oost-Indirhe compagnie-V.O.C) in Dang ngoai (1637-1700)-Documents and problems for further studies

The Northern delte in the strategic offensive in Winter of 1953 and Spring of 1954 and in the Dien Bien Phu Campaign

The Soviet-Vietnamese relations in the 1945-75 period in retrospect