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khoa thong » hoa thong, thoai thong, pho thong
sach toan » hach toan, sach tranh, hoach toan
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
sach tac » sach bac, sach tai, sach tham
hoc sach » hoc sinh, hoc cac, hoc anh
tu sach » thu sach, su sach, te sach
khoa he » hoa he, khoa hoc, khong he
tac hoc » trac hoc, toc hoc, bac hoc
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