Perhaps you should try some spelling variations:
thanh chung » thanh chuong, thanh hung, thanh phuong
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong tan, truong thanh
hieu quan » hieu qua, lieu quan, thien quan
chung cua » chung cu, dung cua, huong cua
cua nhung » va nhung
toan cao » toan ban, toan tap

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 quan)) - thanh chung cua nhung ((cong thanh) OR (cong trinh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quan)) - thanh chung cua nhung ((cong thanh) OR (cong trinh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu quan)) - thanh chung cua nhung ((cong thanh) OR (cong trinh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quan)) - thanh chung cua nhung ((cong thanh) OR (cong trinh)) toan cao*.