Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
cong thuong » hang thuong
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
thuong tan » thuong han, thuong lan, thuong tin
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) or (chieu xanh)) - tinh quang thanh cong thuong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu xanh)) - tinh quang thanh cong thuong tan van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu xanh)) - tinh quang thanh cong thuong tan van ban*.