Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
hang khoa » dung khoa
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
huu mon » huu son, hau mon, huu mot
mon hoc » toan hoc, dong hoc
cua hai » qua hai, cua dai, cua hoi
hai van » thai van, ha van, hai tan

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 mon hoc hang khoa hoc cua hai 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 mon hoc hang khoa hoc cua hai van luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc cac ((cong tan) or (cong san)), nghien huu mon hoc hang khoa hoc cua hai van luan van*.