bác hỏi khó quá, thôi bác tắc bếp đi...tui tìm đỏ mắt chưa thấy tại vì người tiết lộ ẩn danh
Thôi bác coi đở:

Claims by neighbouring countries
Southern Vietnam once declared that the country automatically inherited the rights of the former colonial power France, and also of territories occupied by Japan during the war. The latter decision was derived from the fact that during the San Francisco Conference of 1951, the Vietnamese representative had declared both the Paracel Islands and the Spratly Islands as part of Vietnam – and no objection had been brought forward. Yet during the Geneva Conference of 1954, France only conceded that Vietnam obtain the Paracel Islands, while France retain sovereignty over the Spratlys. South Vietnam continued to claim both archipelagoes on disputable historical/archaeological grounds. North Vietnam in 1958 weakened the arguments of the south by seemingly accepting the Chinese claims over the whole area, but at least the 12-nautcail miles zone around the islands.

After reunification Vietnam occupied several islands of both archipelagoes and so created faits accomplits much stronger than any of the older arguments. This happened in two steps, namely in 1975, and in 1988. Thereafter Vietnam also established a 200-miles exclusive economic zone (EEZ) around the islands, but now its claims are restricted to 12-mile zones around the islands, atolls and rocks, but nonetheless impede the Chinese of rights on these spots.