Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cong hoc » dong hoc, cong hoa, cong coc
nhan tao » nhan tai, nhan dan
tu mach » tu cach, tu manh, tu hach
hoi van » hoi dan, hai van, hoi han
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 cua cong hoc khanh hoa hoc xa ((hoi van) or (hoi va)) nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cua cong hoc khanh hoa hoc xa ((hoi van) OR (hoi va)) nhan tao.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cua cong hoc khanh hoa hoc xa ((hoi van) or (hoi va)) nhan tao*.