Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tang luan » dung luan
trong van » trong cac
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan han » dan chan, dan than, dan hanh
han tap » han tai, toan tap, nhan tai

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