Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
thanh don » thanh dong, thanh son, thanh do
don thuoc » dong thuoc, dung thuoc, dang thuoc
thuoc xa » thuoc ma, thuoc va, thuoc la
phan van » pham van, thanh van, luan van
su sach » so sach, vu sach
hoi tap » hoi dap, hoi tai, hai tap
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va phan » van phan, va phat, va phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((hoi tap) or (hoc tap)), nghien cuu mon hoc thanh don thuoc xa hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((hoi tap) OR (hoc tap)), nghien cuu mon hoc thanh don thuoc xa hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: su sach ((hoi tap) or (hoc tap)), nghien cuu mon hoc thanh don thuoc xa hoi va phan van*.