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nuoc hang » nuoc dang, ngoc thang, nuoc nhung
hang khoa » dung khoa
sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
sach thi » sach thu, sach tai, sach thieu
thi nuoc » thi ngoc, thi quoc, thon nuoc
khoa pho » khoa phu, khoa khoa, khoa phau
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
khoa he » hoa he, khoa hoc, khong he