Perhaps you should try some spelling variations:
phuong danh » phuong anh, phuong dinh, phuong hanh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc dieu » hoc thieu, hoc hien
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
toan cao » toan ban
toan tap » toan ban

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: hoc dieu hanh - hanh tranh ((cua dung) OR (cua dang)) phuong danh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc dieu hanh - hanh tranh ((cua dung) OR (cua dang)) phuong danh ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh tranh ((cua dung) OR (cua dang)) phuong danh ((toan cao) or (toan tap))*.