Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hieu manh, nghiep nganh
cong quang » luong quang, thong quang, duong quang
quang dang » quang dung, quang dong, quang hoang
dang muong » dang cuong, lang muong, dang thuong
hiem ngan » kim ngan, viem gan
muong dan » huong dan, muong van, tuong dan
dan van » dang van, doan van, dao van

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