Perhaps you should try some spelling variations:
thuyet trinh » thuyet kinh
hoc thuyet » hoc chuyen
nhung cong » dung cong, thong cong, hang cong
hang luan » tang luan, dung luan
van nhung » van nhuong, va nhung, van hung
van toan » van tuan, van tan, van thanh
dan chan » dan gian, dan ca
van chat » cao 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 - hang luan van nhung cong ((van toan) or (((dan chan) or (van chat)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet trinh - hang luan van nhung cong ((van toan) OR (((dan chan) OR (van chat)))) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thuyet trinh - hang luan van nhung cong ((van toan) or (((dan chan) or (van chat)))) cau*.