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nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hanh tuong » manh tuong, hanh trong, hanh tung
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
hoc hanh » hoc nhanh, hoc thanh, hoc anh
tuong ho » tong hop
gian dan » gian lang
tu sach » thu sach, su sach, te sach
ho ma » hoc ma, co ma, ho ba