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nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
gian lang » gian dan
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
cac khoi » cac khoan, cach thoi, hoc khoi
cac thoi » cac toi, cac hop, cac tro
va gian » va gianh, van gian, va giai
cuu co » huu co, cua co, cuu mo