Perhaps you should try some spelling variations:
chai tinh » chau tinh, thai tinh, cham tinh
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, cong san, dong san
chi tinh » chi minh, chi binh, cha tinh
tranh va » tranh van, trang va, trinh va
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi tinh) OR (chai tinh)) - canh tranh va dung ((trong dan) or (trong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi tinh) OR (chai tinh)) - canh tranh va dung ((trong dan) OR (trong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi tinh) OR (chai tinh)) - canh tranh va dung ((trong dan) or (trong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chi tinh) OR (chai tinh)) - canh tranh va dung ((trong dan) or (trong san)) toan cao*.