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vung thanh » vuong thanh, vung nhanh, dung thanh
thai vung » thai cong, thai van
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thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
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khoa hoc » hoa hoc
cong so » cong san, cong hoa
xa thai » ca thai, a thai, da thai
hoc xa » hoc ma