Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
phan cong » thanh cong
mach hoc » cach hoc, dich hoc, anh hoc
cong hoa » dong hoc, hang hoa
dong hoa » dong hoc, dong co
cong hoc » dong hoc, cong coc, cong ho
dan nhan » danh nhan, dan chan, van nhan
nhan tao » nhan tai, nhan dan
tu mach » tu cach, tu manh, tu hach
hoi dan » hoa dan, hoc dan, hoi dap
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 mach hoc tap, nghien cac ((cong hoa) or (dong hoa)) phan cong hoc xa hoi dan nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cac ((cong hoa) OR (dong hoa)) phan cong hoc xa hoi dan nhan tao*.