Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
toc benh » hoc benh, soc benh, doc benh
benh hoc » sinh hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
huu mot » cuu mot, huy mot, hieu mot
hoc tai » hoc dai, hoc giai, nuoc tai
hoc bai » hoc dai, hoc giai
va nhan » van nhan, ca nhan, va phan
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc benh hoc tap, nghien huu mot ((hoc tai) or (hoc bai)) khoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc benh hoc tap, nghien huu mot ((hoc tai) OR (hoc bai)) khoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: toc benh hoc tap, nghien huu mot ((hoc tai) or (hoc bai)) khoa hoc xa hoi va nhan dan*.