Perhaps you should try some spelling variations:
sach thoi » cach thoi, sach hoi, sach tham
dan chong » dan phong, van chuong, dan phuong
thoi tap » toi tap, hoc tap, thoi dai
phat van » pham van, phan van, phap van
su sach » so sach, vu sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc xa » hoc ma

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 thoi tap, nghien cuu mon hoc ((dan chong) or (doan phuong)) hoc xa hoi va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thoi tap, nghien cuu mon hoc ((dan chong) OR (doan phuong)) hoc xa hoi va phat van.
• Adding a wildcard symbol may retrieve word variants: su sach thoi tap, nghien cuu mon hoc ((dan chong) or (doan phuong)) hoc xa hoi va phat van*.