Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cung hoc » chung hoc, dung hoc, ung hoc
vung hoc » dung hoc, vung moc, trung hoc
tai khoa » da khoa, noi khoa
khoa van » hoa van, khoa can, khoa luan
van nhan » van phan, van thanh, danh nhan
nhan tao » nhan tai, nhan dan
tu mach » tu cach, tu manh, tu hach
cong co » dong co, cong cu, cong so

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cac cong co phan ((cung hoc) or (vung hoc)) tai khoa van nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cac cong co phan ((cung hoc) OR (vung hoc)) tai khoa van nhan tao.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cac cong co phan ((cung hoc) or (vung hoc)) tai khoa van nhan tao*.