Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
cac cong » cua cong
khoa hoc » hoa hoc
von luan » tong luan
hoc tang » hoc bang, hoc tieng, hoc trong
cong tan » cong tac, cong san, cong thanh
hoc tan » hoc dan, hoc tap, hoc tai
huu mot » cuu mot, huy mot, hieu mot
hai von » hai van, hai con, hai son
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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) OR (hoc tan)) khoa hoc xa hai von luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc cac cong tan, nghien huu mot ((hoc tang) OR (hoc tan)) khoa hoc xa hai von luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc cac cong tan, nghien huu mot ((hoc tang) OR (hoc tan)) khoa hoc xa hai von luan van*.