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