Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
nhan dan » phan dau, gian dan, nhan tai
so sach » so sanh, bo sach, co sach
hoi tap » hoi dap, hoc tap, hoi tai
va nhan » van nhan, ca nhan, va phan
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoi tap, nghien cuu mo hoc nganh ((khoa hoc) OR (hoa hoc)) xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoi tap, nghien cuu mo hoc nganh ((khoa hoc) OR (hoa hoc)) xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: so sach hoi tap, nghien cuu mo hoc nganh ((khoa hoc) OR (hoa hoc)) xa hoi va nhan dan*.