Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu quang » thieu quang, hieu quan, hieu qua
canh doanh » hanh doanh, chinh doanh, doanh doanh
chong cong » thong cong, cuong cong, phong cong
cong cong » cong dong, trong cong, dung cong
doan van » doan va, hoang van, luan van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) or (hieu quang)) - canh doanh nhan ((chong cong) OR (cong cong)) doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (hieu quang)) - canh doanh nhan ((chong cong) OR (cong cong)) doan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) or (hieu quang)) - canh doanh nhan ((chong cong) OR (cong cong)) doan van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (hieu quang)) - canh doanh nhan ((chong cong) OR (cong cong)) doan van ban*.