Perhaps you should try some spelling variations:
tranh cua » doanh cua, manh cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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) or (theo tieu)) xanh - canh tranh cua dung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo tieu)) xanh - canh tranh cua dung cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo tieu)) xanh - canh tranh cua dung cong dan chan cau*.