Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh luan
hang khoa » dung khoa
ban hang » ngan hang
luan ket » lien ket
qua kieu » qua tieu, qua dieu, xuan kieu
kieu nha » lieu nha, kieu khac, hieu nhat
nha kinh » than kinh, nhan sinh, qua kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ban hang khoa luan ket qua kieu nha kinh ((doanh hoan) OR (doanh nhan)) hien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ban hang khoa luan ket qua kieu nha kinh ((doanh hoan) OR (doanh nhan)) hien".
• Adding a wildcard symbol may retrieve word variants: ban hang khoa luan ket qua kieu nha kinh ((doanh hoan) OR (doanh nhan)) hien*.