Perhaps you should try some spelling variations:
doanh trong » doanh tong, doanh thuong, dinh trong
sach thoi » cach thoi, sach hoi, sach tham
thoi trac » thi trac, thoi trang, thi tran
cong toan » cong tan, cong hoan, cong tuan
trac toan » tranh toan, tap toan, tam toan
cuu cong » cua cong, thu cong, cac cong
toan tai » toan tap, doanh tai, toan ban
su sach » so sach, vu sach

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 trac, nghien cuu cong toan doanh trong ((hoc xa) or (hoc ma)) hoi trac toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thoi trac, nghien cuu cong toan doanh trong ((hoc xa) OR (hoc ma)) hoi trac toan tai.
• Adding a wildcard symbol may retrieve word variants: su sach thoi trac, nghien cuu cong toan doanh trong ((hoc xa) or (hoc ma)) hoi trac toan tai*.