Perhaps you should try some spelling variations:
tuan thuong » toan thuong, thanh thuong, phan thuong
thanh trung » thanh tung
than thuong » thanh thuong, phan thuong, han thuong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trong ban » trong san, trong tan, trong quan
ban toan » bai toan, ban than, van 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 ((tuan thuong) OR (than thuong)) trong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - thanh trung ((tuan thuong) OR (than thuong)) trong ban toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - thanh trung ((tuan thuong) OR (than thuong)) trong ban toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - thanh trung ((tuan thuong) OR (than thuong)) trong ban toan cau*.