Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
trong hoc » truong hoc, tuong hoc, trong hoa
thong hoc » thuong hoc, tuong hoc, thong hoa
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
so sach » so sanh, bo sach, co sach
nha dan » nhan dan, nhac dan, nha van
hoc xa » hoc ma

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 hoc tap, nghien cuu ((trong hoc) OR (thong hoc)) nganh khoa hoc xa hoi dap nha dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien cuu ((trong hoc) OR (thong hoc)) nganh khoa hoc xa hoi dap nha dan".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu ((trong hoc) OR (thong hoc)) nganh khoa hoc xa hoi dap nha dan*.