Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach hoc » cach hoc, sach hoi, mach hoc
toan hoc » van hoc, hoa hoc, tin hoc
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
te sach » toc sach
va phan » van phan, va phat, va phap
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: te sach hoc tap, nghien cuu ((toan hoc) OR (toan khoa)) nganh khoa hoc xa hoi va phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cuu ((toan hoc) OR (toan khoa)) nganh khoa hoc xa hoi va phan dau".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu ((toan hoc) OR (toan khoa)) nganh khoa hoc xa hoi va phan dau*.