Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach doi » sach hoi, sach moi, sach bai
sach dao » lanh dao
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
va nhan » van nhan, ca nhan, va phan
mo hoc » mon hoc, co hoc
ma hoi » mai hoi, 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: toc ((sach doi) OR (sach dao)) tap, nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach doi) OR (sach dao)) tap, nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: toc ((sach doi) OR (sach dao)) tap, nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan*.