Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phuong hoang
xuan nguyen » toan nguyen, tran nguyen, hoang nguyen
thieu tinh » trieu tinh, chieu tinh, thien tinh
doanh luan » doanh nhan
phung cong » nhung cong, phong cong, nhung chong
nguyen tap » nguyen tac, nguyen tan, nguyen tat
hoc thieu » toc thieu, hoc hien

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

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