Perhaps you should try some spelling variations:
chao hieu » cao hieu, co hieu, chi hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dang » hanh dong, anh dang, hanh dung
cong cong » cong dong, trong cong, dung cong
pha cong » phan cong, pham cong, phap cong
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao hieu lang - ((hanh dang) or (van dong)) pha cong cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao hieu lang - ((hanh dang) OR (van dong)) pha cong cong dan van ban*.