Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
va nhan » van nhan, ca nhan, va phan
mo hoc » mon 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: "te sach hoc tap, nghien cuu ((mo hoc) OR (co hoc)) nganh khoa hoc xa hoi va nhan dan~".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu ((mo hoc) OR (co hoc)) nganh khoa hoc xa hoi va nhan dan*.