Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cong quan » cuong quan, cong quang, tong quan
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
thanh bac » nhanh bac, thanh bai, thanh san
doc hieu » toc thieu, hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan
hanh cac » hang cac, hanh cat, hanh cham

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 lang - thanh cong quan dung cong ban ((hanh cac) or (thanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh cong quan dung cong ban ((hanh cac) OR (thanh bac)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh cong quan dung cong ban ((hanh cac) or (thanh bac))*.