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sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
hoc khong » hoa khong, hoc hong, khoi khong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
sach tri » sach tai, sach truc, sach bai
tri truc » tri thuc, thi truc, tri thuoc
truc anh » truc nano, truc tinh, truc bach
khoa hoc » hoa hoc
te sach » toc sach
khoa he » hoa he, khong he, khoa thu
so sach » so sanh, bo sach, co sach
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