Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
doanh khoa » toan khoa
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach hoi » sach doi, sach moi, cach thoi
cac cong » cua cong
cong coc » cong cuoc, cong cac, cong co
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
hoi cau » hoi chu, hoc cau, hoa cau
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 cac cong coc ((doanh khoa) or (nganh hoa)) hoc xa hoi cau nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien cac cong coc ((doanh khoa) OR (nganh hoa)) hoc xa hoi cau nhan dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cac cong coc ((doanh khoa) or (nganh hoa)) hoc xa hoi cau nhan dan*.