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sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
khoa toan » khoa than, hoa toan, khoa luan
thu sach » tu sach, thuat sach, thuoc sach
khoa pho » khoa phu, khoa khoa, khoa phau
tri thuc » tri tue
thuc van » thuc vat, thuc dan, thuc va
van khoa » van hoa, von khoa, san khoa
cac tri » cac tro, cac toi, cac thi
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