Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hieu xanh » chieu xanh, hieu manh, hieu nganh
dang luan » dung luan, hang luan, dan luan
tang luan » dung luan
dung cong » dung trong
thanh van » thanh san, thanh toan, thanh phan
doc hieu » toc thieu, hoc thieu, hoc hien

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 - anh ((dang luan) or (tang luan)) dung cong thanh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - anh ((dang luan) OR (tang luan)) dung cong thanh van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - anh ((dang luan) or (tang luan)) dung cong thanh van ban*.