Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
sach hoc » cach hoc, sach hoi, mach hoc
nhan van » nhan dan, phan van, nha van
so sach » so sanh, bo sach, co sach
nhan va » nhan tai, nhan dan, nhan tao
mo hoc » mon hoc, co hoc
hoc xa » hoc ma

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien cuu mo hoc khanh hoa hoc xa hoi va ((nhan van) OR (nhan va))~".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu mo hoc khanh hoa hoc xa hoi va ((nhan van) OR (nhan va))*.