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nghien cua » nghien cuu, nghiep cua, nghiep vua
cua thanh » gia thanh, va thanh, ha thanh
thanh hoc » thanh hoa, than hoc, thanh ho
phan dau » phan tu, hang dau
sach hoi » sach doi, sach moi, cach thoi
van phan » van phong, van thanh, luan phan
toan hoa » toan khoa, toan hoat, toan hoc
hoc toan » hoc tan, hop toan, hoa toan
hoc mai » hoc ma, hoc bai, hoc may
hoc dai » hoc dan
hoi van » hoi va, hoi dan, hai van
hoi tap » hoi dap, hoc tap, hoi tai
vu sach » vu bach, su sach, vu khach