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sach hoc » cach hoc, sach hoi, mach hoc
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
tinh van » trinh van, dinh van, tinh va
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc san » hoc dan, toc san, hoc can
hoc xa » hoc ma
ho cuu » ho chu, ho cua, so cuu
xa ho » xa hoi, xa hoa, xa hoc
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