Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
giang day » gian dan
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong ho
cong coc » cong cuoc, cong cac, cong co
khoa hoc » hoa hoc
va giang » van giang, ha giang, va gian
tu sach » thu sach, su sach, te sach
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: tu sach hoc tap, nghien cuu ((cong hoc) OR (cong coc)) nganh khoa hoc xa hoi va giang day~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu ((cong hoc) OR (cong coc)) nganh khoa hoc xa hoi va giang day".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((cong hoc) OR (cong coc)) nganh khoa hoc xa hoi va giang day*.