Perhaps you should try some spelling variations:
chinh doanh » kinh doanh
doanh luan » doanh nhan
cong thanh » dong thanh, cong trinh, cong tan
thanh pham » thanh phan, thanh pho, thanh hai
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
pham cac » phan cac, pham ca, pham can

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 sang) OR (hieu lang)) - chinh doanh luan dang cong thanh pham cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) OR (hieu lang)) - chinh doanh luan dang cong thanh pham cac".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) OR (hieu lang)) - chinh doanh luan dang cong thanh pham cac*.