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