Perhaps you should try some spelling variations:
phan khong » phan hong, nhan khong, pham khong
khong hoc » khung hoc, thong hoc, khong thuoc
bach hoc » bac hoc, cach hoc, bach hoa
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc phan » hoc dan, hoc pho
nhan dan » phan dau, gian dan, nhan tai
hoi cua » hoi chuc
hoc xa » hoc ma
hoi ca » hoi cac, hoi cau, hoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach hoc tap, nghien cuu cong hoc phan khong hoc xa ((hoi ca) or (hoi cua)) nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach hoc tap, nghien cuu cong hoc phan khong hoc xa ((hoi ca) OR (hoi cua)) nhan dan.
• Adding a wildcard symbol may retrieve word variants: vu bach hoc tap, nghien cuu cong hoc phan khong hoc xa ((hoi ca) or (hoi cua)) nhan dan*.