Perhaps you should try some spelling variations:
doanh tong » doanh trong, doanh thuong, anh tong
sach thoi » cach thoi, sach hoi, sach tham
van doanh » toan doanh, van dong, van thanh
tai doanh » trai doanh, tri doanh, lai doanh
thoi tai » thoi dai, phoi tai, tuoi tai
cuu cong » thu cong, cac cong
tong hoc » tuong hoc, thong hoc, trong hoc
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
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 ((cuu cong) or (cua cong)) van doanh tong hoc xa hoi tai doanh tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thoi tai, nghien ((cuu cong) OR (cua cong)) van doanh tong hoc xa hoi tai doanh tai.
• Adding a wildcard symbol may retrieve word variants: su sach thoi tai, nghien ((cuu cong) or (cua cong)) van doanh tong hoc xa hoi tai doanh tai*.