Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hieu manh, nghiep nganh
cong quang » luong quang, thong quang, duong quang
quang lang » quan lang, quang dang, quang hoang
lang muong » lang tuong, long muong, nang luong
hiem ngan » kim ngan, viem gan
muong dan » huong dan, muong van, tuong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 (hiem ngan)) - thanh cong quang lang muong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (hiem ngan)) - thanh cong quang lang muong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (hiem ngan)) - thanh cong quang lang muong dan chan cau*.