Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
tuong cua » truong cua, huong cua, thong cua
cua nhung » va nhung
van toan » van tuan, van tan, van thanh
tap doan » tap quan

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