Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh dung » thanh dung, anh dung, hanh dong
van cong » van dong, van phong, phan cong
cong hat » cong nhat, cong chat, cong ha
hat phan » hat nhan, sat phan, vat phan
phan lap » phan dau
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) sang - hanh dung luan van cong hat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sang - hanh dung luan van cong hat phan lap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sang - hanh dung luan van cong hat phan lap*.