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