Perhaps you should try some spelling variations:
nghien cau » nghien cuu, nghiep cau, nghiep cay
benh hoc » sinh hoc
cau hang » cau hoang, cau thang, cuu khang
va nganh » da nganh, ve nganh, cac nganh
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
tu benh » tru benh, thu benh, tuy benh
va ngan » van ngan, vu ngan, va ngay
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu benh hoc tap, nghien cau hang ((va nganh) OR (va ngan)) khoa hoc xa hoi ca nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu benh hoc tap, nghien cau hang ((va nganh) OR (va ngan)) khoa hoc xa hoi ca nhan van".
• Adding a wildcard symbol may retrieve word variants: tu benh hoc tap, nghien cau hang ((va nganh) OR (va ngan)) khoa hoc xa hoi ca nhan van*.