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tranh thuc » trinh thuc, trang thuc, thanh thuy
khoa thoai » hoa thai, hoi thoai, khoa than
can tranh » canh tranh, tan tran, van ranh
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
sach tai » sach bai, sach tham, sach dao
cac khoa » cac khoan, cac khoi, dac khoa
khoa he » hoa he, khoa hoc, khong he
tu sach » thu sach, su sach, te sach
tai tuc » thai tuc, tai cuc, tai tu
tuc cac » tu cac, tich cac
su can » su van, su cao, tu can