Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
khang cao » khang chan, quang cao, hang ca
duong va » duong van, dung va, luong va
va thong » va thuong, va phuong, he thong
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - thanh duong va thong cong san ((khang cao) or (nang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh duong va thong cong san ((khang cao) OR (nang cao)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh duong va thong cong san ((khang cao) or (nang cao))*.