Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
tang khoa » hang khoa, dang khoa, tang kha
cac cong » cua cong
cong tan » cong tac, cong san, cong thanh
hoc tang » hoc bang, hoc tan, hoc tieng
khoa hoc » hoa hoc
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, hai tan, hao van
hoc xa » hoc ma
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, nghien huu mot hoc tang khoa hoc xa ((hai van) OR (ha van)) luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc cac cong tan, nghien huu mot hoc tang khoa hoc xa ((hai van) OR (ha van)) luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc cac cong tan, nghien huu mot hoc tang khoa hoc xa ((hai van) OR (ha van)) luan van*.