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cua thuoc » nha thuoc, cay thuoc, cua nuoc
sach doi » sach hoi, sach moi, sach dao
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
van gian » van giang, dan gian, van giao
gian dan » gian lang
su sach » so sach, vu sach
doi tap » doi tac, doi dap, doi tai
cua hoa » cua khoa, cua hoi, cua hoc
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma
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