Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh vat » trinh vat, tranh va, tranh van
dung cong » dung trong
cong dang » cong dong, cong dan, cong dung
hoc hieu » hoc thieu, hoc hien, doc hieu
vat dung » van dung, va dung, viet dung
dang van » hoang van, hang va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - canh tranh vat dung cong dang van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - canh tranh vat dung cong dang van ban*.