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khoa thong » hoa thong, thoai thong, pho thong
cach thai » cach thoi, sach tham, lich thai
cac khong » cac phong, cat khong, cac phuong
ban thuoc » dang thuoc, cay thuoc, nam thuoc
thuoc san » thuc san, thuoc ban, thuoc tan
khoa khoa » hoa khoa, khuan khoa, khoa hoc
thai hoc » dai hoc, bai hoc, hoi hoc
sach ban » sach bai, sach han, sach bac
san khoa » toan khoa, hang khoa, da khoa
tu cach » tu cac
hoc cac » hoc cao
su sach » so sach, vu sach