Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
dang khoa » dung khoa, hang khoa, dang khoi
cac cong » cua cong
cong tan » cong tac, cong san, cong thanh
hoc dang » hoc dan, hoc dung, hoc bang
von luan » tong luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai von » hai van, hai con, hai son

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 dang khoa ((hoc xa) or (hoc ma)) hai von luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc cac cong tan, nghien huu mot hoc dang khoa ((hoc xa) OR (hoc ma)) hai von luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc cac cong tan, nghien huu mot hoc dang khoa ((hoc xa) or (hoc ma)) hai von luan van*.