Perhaps you should try some spelling variations:
phan cong » thanh cong
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
cong hoc » dong hoc, cong hoa, cong coc
nhan van » nhan dan, nhan va, phan van
su mach » su sach
hoa van » hoa dan, hoang van, hoa phan
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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 cuu dong co phan cong hoc xa hoa van ((nhan van) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu dong co phan cong hoc xa hoa van ((nhan van) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu dong co phan cong hoc xa hoa van ((nhan van) or (phan tu))*.