Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
toc chieu » toc thieu, doc hieu, hoc thieu
cong ngan » cong ngang, dong ngan, long ngan
cong nhan » cong nhat, cong thanh, cong san
cong dac » cong tac, cong dan, cong cac
dac dung » dan dung, tac dung, duc dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc chieu sang - thanh cong dac dung ((cong ngan) or (cong nhan)) chung cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc chieu sang - thanh cong dac dung ((cong ngan) OR (cong nhan)) chung cu.
• Adding a wildcard symbol may retrieve word variants: toc chieu sang - thanh cong dac dung ((cong ngan) or (cong nhan)) chung cu*.