Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
doanh phan » doanh nhan, doan phan, doanh thanh
hoi doanh » hoa doanh, voi doanh, doi doanh
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
hoc danh » hoc dan, hoc anh, hoc hanh
danh hoa » thanh hoa, khanh hoa, nganh hoa
hoc xa » hoc ma

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach hoc) OR (cach hoc)) tap, nghien cac cong hoc danh hoa hoc xa hoi doanh phan tu~.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach hoc) or (cach hoc)) tap, nghien cac cong hoc danh hoa hoc xa hoi doanh phan tu*.