Perhaps you should try some spelling variations:
thanh trung » thanh tung
dung phuong » dung thuong, bang phuong, dung chung
chieu sang » chieu sach, chieu xanh, nhieu tang
phuong dan » phuong danh, phuong doan, huong dan
hieu lang » hieu quang, nhieu tang, hieu van
trung va » truong va, trang va, trung ha
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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 lang)) - thanh trung va dung phuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh trung va dung phuong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - thanh trung va dung phuong dan toan cao*.