Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
hoc tang » hoc bang, hoc tan, hoc tieng
tang kha » tang ha, tang khu, hang khoa
van luan » van quan, van tuan, von luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
kha hoc » khoa hoc, nha hoc, kha hoa
hoc xua » hoc cua, hoc xa, hoc lua
xua ha » xuan ha, xua hai, xua va
ha van » hoa van, nha van, va van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc cac ((cong tan) or (cong san)), nghien huu mot hoc tang kha hoc xua ha van luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc cac ((cong tan) OR (cong san)), nghien huu mot hoc tang kha hoc xua ha van luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc cac ((cong tan) or (cong san)), nghien huu mot hoc tang kha hoc xua ha van luan van*.