Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
cong quang » luong quang, thong quang, duong quang
quang lang » quan lang, quang dang, quang hoang
lang muong » lang tuong, long muong, nang luong
muong van » duong van, luong van, muong va
van toan » van tuan, van tan, van thanh
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 quang lang muong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (viem gan)) - thanh cong quang lang muong van toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (viem gan)) - thanh cong quang lang muong van toan ban*.