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thanh nhan » thanh phan, thanh san, thanh toan
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoi thanh » hoc thanh, hai thanh, hoa thanh
nhan dan » phan dau, gian dan, nhan tai
toan hoc » toan khoa, van hoc, hoa hoc
khoa hoc » hoa hoc
tan khoa » toan khoa, tran khoa, san khoa
cua toan » cuu toan, xuan toan, cua thanh
sach hoi » sach doi, cach thoi, hoach hoi
sach moi » sach doi, bach mai, sach bai
hoc tan » hoc tang, hoc dan, hoc tap
hoc xa » hoc ma