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thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
huu tinh » cuu tinh, huu dinh, huu binh
tinh van » trinh van, dinh van, tinh va
cuu mot » cua mot, huu mot, cuu vuot
hoc san » hoc dan, toc san, hoc can
hoc xa » hoc ma
xa so » ma so, va so, ka so
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