Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
phan xuong » phan cong
xuong hoc » duong hoc, tuong hoc, truong hoc
mach hoc » cach hoc, dich hoc, anh hoc
cong hoa » dong hoa, dong hoc
hang hoa » hang khoa, thanh hoa, hang va
van phan » van phong, van thanh, luan phan
phan tao » nhan tao, phan tap, phan tan
tu mach » tu cach, tu manh, tu hach
hoi van » hoi va, hoi dan, hai van
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 (hang hoa)) phan xuong hoc xa hoi van phan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cac ((cong hoa) OR (hang hoa)) phan xuong hoc xa hoi van phan tao*.