Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
hieu lang » chieu sang, hieu quang, nhieu tang
lang cong » dang cong, bang cong, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
ban than » ban thanh, van thanh, ban hang
cong va » dong va, cong ha, cong tac
va lang » va nang, hoa lang

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 va lang cong ((ban than) or (cang thang)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh cong va lang cong ((ban than) OR (cang thang)) cap*.