Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
khanh luan » khanh thuan, doanh luan, hang luan
khang cong » hang cong, thanh cong, dang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
van khang » van khanh, van thanh, van quang
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan

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 ((thieu xanh) OR (hieu manh)) - khanh luan van khang cong ((san toan) OR (dan toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - khanh luan van khang cong ((san toan) or (dan toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - khanh luan van khang cong ((san toan) or (dan toan)) cau*.