Perhaps you should try some spelling variations:
chinh doanh » kinh doanh
phuong danh » phuong anh, phuong dinh, phuong thanh
phuong hanh » phuong thanh, phuong anh, phuong hoang
hieu sang » chieu sang, hieu lang, hieu quang
doanh cua » doanh luan
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - chinh doanh cua dung ((phuong danh) OR (phuong hanh)) ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - chinh doanh cua dung ((phuong danh) OR (phuong hanh)) ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - chinh doanh cua dung ((phuong danh) OR (phuong hanh)) ((toan tai) or (toan cao))*.