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tranh thuc » trinh thuc, trang thuc, thanh thuy
sach tranh » canh tranh
khoa khong » khoi khong, hoa khong, khon khong
nhan cach » phan cac
cach khoa » bach khoa, cac khoan, anh khoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
sach bai » sach dao, cac bai, sach xa
bai nhan » ban nhan, bang nhan, tai nhanh
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
su sach » vu sach
khoa he » hoa he, khoa hoc, khong he
so sach » so sanh, bo sach, co sach