Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
dap thanh » dao thanh, dat thanh, da thanh
sach hoi » sach doi, sach moi, cach thoi
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
dan hoan » van hoan, dan hoat, dan toan
su sach » so sach, vu sach
hoi tap » hoc tap, hoi tai, hai tap
hoc mai » hoc ma, hoc dai, hoc may
hoc bai » hoc dai, hoc giai

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tap, nghien cuu dong hoc dan hoan ((hoc mai) OR (hoc bai)) hoi dap thanh phan~".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cuu dong hoc dan hoan ((hoc mai) OR (hoc bai)) hoi dap thanh phan*.