Perhaps you should try some spelling variations:
thanh phi » thanh pho, thanh phan, thanh pham
cong thon » cong thong, nong thon, cong hon
thon tham » chon tham, chong tham, thong thai
tham luan » pham luan, thai luan, ham luan
van cong » van dong, van phong, phan cong
doi chi » doi khi
phi van » phi san, thi van, phi va

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

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