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thanh van » thanh san, thanh toan, thanh phan
cau thanh » cuu thanh, cac thanh, cau thang
hoc nganh » hoc nhanh
nang hoc » nang doc, nang luc, dong hoc
khoa cau » khoa chau, khoa cam, hoa cau
nong hoc » dong hoc, nong thon, duong hoc
sach hoc » cach hoc, sach hoi, mach hoc
xa khoa » da khoa, bia khoa, tai khoa
tu sach » thu sach, su sach, te sach
mo hoc » mon hoc, co hoc
huu mo » huu mot, huu co, huu ho