Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
danh nhan » doanh nhan, thanh nhan, benh nhan
mach hoc » cach hoc, dich hoc, anh hoc
sach hoi » sach doi, sach moi, cach thoi
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
nhan tao » nhan tai, nhan dan
ma hop » mau hop, ma hoa, va hop

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((mach hoc) or (sach hoi)) tap, nghien thu cong hoc doanh khoa hoc ma hop danh nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((mach hoc) OR (sach hoi)) tap, nghien thu cong hoc doanh khoa hoc ma hop danh nhan tao.
• Adding a wildcard symbol may retrieve word variants: so ((mach hoc) or (sach hoi)) tap, nghien thu cong hoc doanh khoa hoc ma hop danh nhan tao*.