Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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 qua)) - thanh tung ((cua dung) or (qua dung)) cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu qua)) - thanh tung ((cua dung) OR (qua dung)) cong van toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu qua)) - thanh tung ((cua dung) or (qua dung)) cong van toan ban*.