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sach tien » sach tren, sach thieu
tan thong » toan thong, tran thong, tao thong
thu sach » tu sach, thuat sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
tien hoc » tin hoc, tien hoa, dien hoc
cac khoi » cac thoi, cac khoan, cach thoi
tri hoc » triet hoc, tri thuc, thai hoc
hoc anh » hoc nganh, hoc nhanh, ngoc anh
anh hoa » anh khoa, danh hoa, hanh hoa
hoa tan » hoa dan, hoa van, hoa tin
te sach » toc sach
hoc cac » hoc cao
khoi he » khoa he, khoi de, khong he