Perhaps you should try some spelling variations:
doanh trong » doanh tong, doanh thuong, dinh trong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
tuan doanh » toan doanh, nhuan doanh, tuan anh
sach thoi » cach thoi, sach hoi, sach tham
cong tuan » cong tan, cong luan, cong thanh
trong hoc » truong hoc, tuong hoc, thong hoc
thoi tai » thoi dai, phoi tai, tuoi tai
tuan tai » toan tai, quan tai, tuan tuoi
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
tan tai » toan tai, tang tai, van tai
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 tai, nghien thu cong tuan doanh trong hoc xa hoi tai ((tuan tai) or (tan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thoi tai, nghien thu cong tuan doanh trong hoc xa hoi tai ((tuan tai) OR (tan tai)).
• Adding a wildcard symbol may retrieve word variants: su sach thoi tai, nghien thu cong tuan doanh trong hoc xa hoi tai ((tuan tai) or (tan tai))*.