Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
hoa binh » hoa sinh
nhan dan » phan dau, gian dan, nhan tai
cac hoc » cach hoc, cac hop, bac hoc
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: tu cac hoc tap, nghien cac cong hoc khanh hoa hoc xa hoa binh ((nhan dan) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac hoc tap, nghien cac cong hoc khanh hoa hoc xa hoa binh ((nhan dan) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: tu cac hoc tap, nghien cac cong hoc khanh hoa hoc xa hoa binh ((nhan dan) or (phan tu))*.