Perhaps you should try some spelling variations:
hanh hang » thanh hang, hang hang, hanh han
hang luan » tang luan, dung luan
cong khan » cong khanh, cong nhan, cong phan
khan phan » than phan, khan than, phan phan
doc hieu » hoc thieu, hoc hien
van cong » van dong, van phong, phan cong
phan lap » phan dau

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 - hanh hang luan van cong khan phan lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) sang - hanh hang luan van cong khan phan lap".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) sang - hanh hang luan van cong khan phan lap*.