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nghien cua » nghien cuu, nghiep cua, nghiep vua
khong phoi » khong phai, phong phoi, khoang thoi
hoc khong » hoa khong, hoc hong, khoi khong
sach hoc » cach hoc, sach hoi, mach hoc
cua toan » cuu toan, xuan toan, cua thanh
toan hoc » toan khoa, van hoc, hoa hoc
phoi hoc » hoi hoc, phoi thuoc, hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
vu sach » vu bach, su sach, vu khach
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma