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thuoc thanh » chuoc thanh, thuc thanh, hoc thanh
thanh khoa » thanh hoa, thanh pho, hang khoa
khoa thong » hoa thong, thoai thong, pho thong
tri thuoc » tri thuc, tri hoc, tin thuoc
sach thai » sach tham, sac thai, sach tai
sach tri » sach tai, sach tren, sach truc
thai hoc » dai hoc, bai hoc, hoi hoc
anh khoa » doanh khoa, hang khoa
te sach » toc sach
tu sach » thu sach, su sach, tu cach
hoc anh » hoc nganh, hoc nhanh, ngoc anh
khoa he » hoa he, khoa hoc, khong he