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sach tranh » canh tranh
khoa thong » hoa thong, thoai thong, pho thong
sach tren » sach tien
tren thuc » trien thuc, tron thuc, trinh thuc
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
thu sach » tu sach, thuat sach, thuoc sach
tranh ve » trinh ve, thanh ve, tranh va
cac khoa » cac khoan, cac khoi, dac khoa
su sach » so sach, vu sach
ve cac » va cac, vien cac
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