Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach hoi » sach doi, sach moi, cach thoi
cong hoa » dong hoa, dong hoc, hang hoa
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
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: tu sach hoi tap, nghien cua cong hoa ((doanh khoa) or (nganh hoa)) hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien cua cong hoa ((doanh khoa) OR (nganh hoa)) hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cua cong hoa ((doanh khoa) or (nganh hoa)) hoc xa hoi va nhan dan*.