Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
duong manh » duong van
hieu lang » chieu sang, nhieu tang, hieu van
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban
tung va » trung va, tuong va, dung va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (hieu quang)) - thanh tung va nhung duong manh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (hieu quang)) - thanh tung va nhung duong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (hieu quang)) - thanh tung va nhung duong manh toan ban*.