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kinh thuc » sinh thuc, dinh thuc, hinh thuc
sach truc » cach thuc, sach tren, sach thu
hoc thong » hoc thuong, hoc trong, hoc hong
thu sach » tu sach, thuat sach, thuoc sach
truc hoc » trac hoc, tru hoc, truc hoa
cao khoi » cac khoi, cao khai, co khoi
thuc van » thuc vat, thuc dan, thuc va
van khoa » van hoa, von khoa, san khoa
khoa hoc » hoa hoc
khoi he » khoa he, khoi de, khong he
su sach » so sach, vu sach
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