Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phuong hoang
dung doanh » dung dan, dung dong
phung cong » nhung cong, phong cong, nhung chong
nguyen tap » nguyen tac, nguyen tat, nguyen tai
nguyen tan » nguyen tuan, nguyen van, nguyen can
hien tinh » khien tinh, thien tinh, bien tinh
doanh cua » doanh luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tinh - dung doanh cua ((phuong cong) or (phung cong)) xuan ((nguyen tap) OR (nguyen tan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - dung doanh cua ((phuong cong) OR (phung cong)) xuan ((nguyen tap) OR (nguyen tan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tinh - dung doanh cua ((phuong cong) or (phung cong)) xuan ((nguyen tap) OR (nguyen tan))".
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - dung doanh cua ((phuong cong) or (phung cong)) xuan ((nguyen tap) OR (nguyen tan))*.