Perhaps you should try some spelling variations:
canh doanh » hanh doanh, chinh doanh, doanh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
doanh luan » doanh nhan
cang thang » cong thanh, dang thanh
hieu lang » hieu quang, nhieu tang, hieu van
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
thang cha » thanh cha, thang cua, khang chan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (chieu sang)) - canh doanh luan ((tong cong) or (dung cong)) cang thang cha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sang)) - canh doanh luan ((tong cong) OR (dung cong)) cang thang cha*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (chieu sang)) - canh doanh luan ((tong cong) or (dung cong)) cang thang cha*".