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sach hoc » cach hoc, sach hoi, mach hoc
hoa toan » hoa tan, hop toan, hoa than
khoa hoc » hoa hoc
gian dan » gian lang
tu sach » thu sach, su sach, te sach
huu mot » cuu mot, huy mot, hieu mot
ca gian » ca giang, ca giao, va gian
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau
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