Perhaps you should try some spelling variations:
thuyet trinh » thuyet kinh
hoc thuyet » hoc chuyen
khanh luan » khanh thuan, doanh luan, hang luan
nhung cong » dung cong, thong cong, hang cong
hanh luan » hang luan, hanh luat, han luan
van nhung » van nhuong, va nhung, van hung
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet trinh - ((hanh luan) OR (khanh luan)) van nhung cong ((dan toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet trinh - ((hanh luan) OR (khanh luan)) van nhung cong ((dan toan) OR (dan chan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuyet trinh - ((hanh luan) OR (khanh luan)) van nhung cong ((dan toan) or (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thuyet trinh - ((hanh luan) OR (khanh luan)) van nhung cong ((dan toan) or (dan chan)) cau*.