Perhaps you should try some spelling variations:
doanh luan » doanh nhan
hieu lang » chieu sang, hieu quang, nhieu tang
cong luan » cong tuan, dong luan, cong luong
tong luan » tang luan, dung luan, hang luan
manh cua » doanh cua, ban cua
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - lanh ((manh cua) or (doanh luan)) nhung ((cong luan) OR (tong luan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - lanh ((manh cua) OR (doanh luan)) nhung ((cong luan) OR (tong luan)) phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - lanh ((manh cua) or (doanh luan)) nhung ((cong luan) OR (tong luan)) phan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - lanh ((manh cua) or (doanh luan)) nhung ((cong luan) OR (tong luan)) phan cau*.