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Nevertheless, the delta soils are simply labored. The diking of the Red River to prevent flooding has deprived the delta’s rice fields of enriching silts they after gained, and it's been needed to use chemical fertilizers.Tên gọi "Việt Nam" cũng xuất Helloện trong tác phẩm Việt Nam vong quốc s�?của Phan Bội Châu năm 1905