Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
van hoang » van hoan, quan hoang, tran hoang
long than » song than, luong thanh, dong thanh
tung van » trung van, tang van, dung van
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu quang)) - thanh tung van hoang ((cong tan) or (long than)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quang)) - thanh tung van hoang ((cong tan) OR (long than)) phan tu.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quang)) - thanh tung van hoang ((cong tan) or (long than)) phan tu*.