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 » dich hoc, anh hoc, bac hoc
cach hoc » cach thuc, cach thoi, dich hoc
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
hoa phan » hoa dan, co phan
van nhan » van phan, van thanh, danh nhan
nhan tao » nhan tai, nhan dan
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) OR (cach hoc)) tap, nghien cac cong hoa phan xuong hoc xa hoi van nhan tao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((mach hoc) OR (cach hoc)) tap, nghien cac cong hoa phan xuong hoc xa hoi van nhan tao*".