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hang khoa » dung khoa
dich hoc » sinh hoc, hinh hoc, tinh hoc
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
tu dich » te dich, chu dich, hut dich
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va nhan » van nhan, ca nhan, va phan
hoc xa » hoc ma