Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
khanh luan » khanh thuan, doanh luan, hang luan
hoc khien » hoc hien, hoc nghien, hoc thieu
dong cong » duong cong, dung cong, dang cong
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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

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