Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
hieu xanh » chieu xanh, hieu manh, hieu nganh
luan dung » lan dung, luan dong, luan hung
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
than cau » toan cau, phan cau, than cap
phan dau » phan tu, hang dau

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 xanh - canh tranh luan dung cong tac ((than cau) or (((phan lap) or (phan dau))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh luan dung cong tac ((than cau) OR (((phan lap) OR (phan dau)))).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh luan dung cong tac ((than cau) or (((phan lap) or (phan dau))))*.