Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
lang muong » lang tuong, long muong, nang luong
cong quan » cuong quan, cong quang, tong quan
quan lang » quan hoang, gian lang, quan luan
muong dan » huong dan, muong van, tuong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu nganh) or (viem gan)) - thanh cong quan lang muong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (viem gan)) - thanh cong quan lang muong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (viem gan)) - thanh cong quan lang muong dan toan ban*.