Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
phan thong » phan thuong, phan hong, phan tong
thong hoc » thuong hoc, tuong hoc, thong hoa
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong coc » cong cuoc, cong cac, cong co
coc phan » co phan, hoc phan, cac phan
phan dau » phan tu, hang dau
su mach » su sach
hoa cau » hoa cac, hoa dau, hoa mau
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su mach hoc tap, nghien cac cong coc phan thong hoc ma ((hoi ca) or (hoa cau)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cac cong coc phan thong hoc ma ((hoi ca) OR (hoa cau)) phan dau.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cac cong coc phan thong hoc ma ((hoi ca) or (hoa cau)) phan dau*.