Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
dat quang » dau quang, chat quang, dang quang
hang khoa » dung khoa
ban hang » ngan hang
dat luan » dan luan, dau luan, bai luan
kieu nha » lieu nha, kieu khac, hieu nhat
nha kinh » than kinh, nhan sinh, qua kinh
thien » thieu, tien, hien

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 ((dat luan) OR (dat quang)) kieu nha kinh doanh hoan thien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ban hang khoa luan ((dat luan) OR (dat quang)) kieu nha kinh doanh hoan thien".
• Adding a wildcard symbol may retrieve word variants: ban hang khoa luan ((dat luan) OR (dat quang)) kieu nha kinh doanh hoan thien*.