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 toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) OR (hiem ngan)) - thanh cong quang lang muong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) OR (hiem ngan)) - thanh cong quang lang muong dan toan cau*.