Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » hieu quang, nhieu tang, hieu van
trong dan » trong dang, trong san, trong tan
dan toan » van toan, dan than, manh toan
toan cau » 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: doi ((chieu sang) OR (hieu lang)) - thanh trung thanh dung trong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - thanh trung thanh dung trong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - thanh trung thanh dung trong dan toan cau*.