Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, nhung don
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sach)) - canh tranh cua ((nhung cong) OR (hang cong)) tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu tinh) or (chieu sach)) - canh tranh cua ((nhung cong) OR (hang cong)) tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sach)) - canh tranh cua ((nhung cong) OR (hang cong)) tac toan cao*.