Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
nghien huy » nghien cuu, nguyen huy, nghiep quy
doanh hoan » doanh khoa, doanh nhan, doanh luan
sach hoi » sach doi, sach moi, cach thoi
huy toan » huy tran, huu toan, huy hoang
toan hoa » toan khoa, toan hoat, toan hoc
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
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: su sach hoi tap, nghien huy toan hoa ((doanh hoan) or (doanh doanh)) hoc xa hoi va van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien huy toan hoa ((doanh hoan) OR (doanh doanh)) hoc xa hoi va van ban.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien huy toan hoa ((doanh hoan) or (doanh doanh)) hoc xa hoi va van ban*.