Perhaps you should try some spelling variations:
thang cong » thanh cong, thang long, thong cong
than trong » thang trong, thuan trong, tran trong
hieu lang » chieu sang, hieu quang, nhieu tang
trong van » trong cac
cong than » cong thanh, cong thang, cong tan
trong tho » trong thoi, trong thu, trong thi
doi hieu » doi chieu, doc hieu, doi hien
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: doi hieu lang - thanh ((dang van) or (trong van)) thang cong than trong tho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh ((dang van) OR (trong van)) thang cong than trong tho*.