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than tieng » phan tieng, toan tieng, thang gieng
sach truc » cach thuc, sach thu, sach thue
bich khoa » bach khoa, dich khoa, bia khoa
pho thong » he thong
sach tren » sach tien, sach tranh
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa than » khoa luan, hoa thai, hoa tan
truc thi » thuc thi, truc tai, thuc thai
khoa pho » khoa phu, khoa khoa, khoa phau
tren thi » trien thi, tran thi, trieu thi
thi hanh » thi thanh
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach