Perhaps you should try some spelling variations:
doanh han » doanh hoan, doanh phan, doanh ban
ban dung » van dung, dan dung, tan dung
cho luan » khoa luan, khao luan, cho phan
luan ket » lien ket
qua tieu » luan tieu
tieu so » thieu so, tieu su, hieu so
so kinh » su kinh, so sinh, so tinh

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "ban dung cho luan ket qua tieu so kinh ((doanh han) OR (doanh nhan)) hien~".
• Adding a wildcard symbol may retrieve word variants: ban dung cho luan ket qua tieu so kinh ((doanh han) OR (doanh nhan)) hien*.