Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
dung khoa » dung cho
hoan hien » hoan thien, han hien, hoa hien
tan dung » tran dung, tin dung, van dung
ket cua » ket qua, keo cua, biet cua
det cua » de cua, dat cua, dep cua
dieu so » hieu so, lieu so, dieu co
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: "tan dung khoa luan ((ket cua) OR (det cua)) dieu so kinh doanh hoan hien~".
• Adding a wildcard symbol may retrieve word variants: tan dung khoa luan ((ket cua) OR (det cua)) dieu so kinh doanh hoan hien*.