Perhaps you should try some spelling variations:
quang dung » quang trung, ung dung, cuong dung
hieu xanh » chieu xanh, hieu manh, hieu nganh
canh tran » canh tranh, hanh trang, banh trang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san chan » san chang, dan chan, san chay
chan ban » can ban, chat ban, chan nan

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 tran quang dung cong san chan ban~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tran quang dung cong san chan ban*.