Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
thong cap » thong cac, trung cap, thong cua
cap nhung » cam nhung, vap nhung, dap nhung
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu lang) OR (hieu quang)) - thanh thong cap nhung cong ((dan toan) or (anh tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (hieu quang)) - thanh thong cap nhung cong ((dan toan) OR (anh tuan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu lang) OR (hieu quang)) - thanh thong cap nhung cong ((dan toan) or (anh tuan)) cau".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) OR (hieu quang)) - thanh thong cap nhung cong ((dan toan) or (anh tuan)) cau*.