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khoa thong » hoa thong, thoai thong, pho thong
thuc sach » thuoc sach, thu sach, thuc cach
khoa khoa » hoa khoa, khuan khoa, khoa hoc
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
nha khoa » nhi khoa, da khoa, bia khoa
kinh hoc » sinh hoc, hinh hoc, tinh hoc
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
hoc cac » hoc cao
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