Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - canh tranh ((cua dung) or (cua dong)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh tranh ((cua dung) OR (cua dong)) cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - canh tranh ((cua dung) or (cua dong)) cong dan toan cau*.