Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach doi » sach hoi, sach moi, sach dao
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
nhan tao » nhan tai, nhan dan
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
nhan va » nhan tai, nhan dan, phan van
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 sach doi tap, nghien cuu cong hoc doanh khoa hoc xa hoi ca ((nhan va) or (nhan tao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu cong hoc doanh khoa hoc xa hoi ca ((nhan va) OR (nhan tao)).
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu cong hoc doanh khoa hoc xa hoi ca ((nhan va) or (nhan tao))*.