Perhaps you should try some spelling variations:
dang dung » dan dung, dang hung, dang quang
cong phan » cong nhan, cong khan, chong phap
phan phan » phap phan, phan phat, than phan
doc hieu » hoc thieu, hoc hien
van cong » van dong, van phong, phan cong
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: ((doc hieu) or (toc thieu)) sang - dang dung luan van cong phan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - dang dung luan van cong phan phan lap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sang - dang dung luan van cong phan phan lap*.