Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
toan tai » toan tap, doanh tai, toan ban
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va toan » van toan, bai toan, tap toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: nguoi sach hoc tap, nghien cuu mon hoc nganh khoa ((hoc xa) or (hoc ma)) hoi va toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach hoc tap, nghien cuu mon hoc nganh khoa ((hoc xa) OR (hoc ma)) hoi va toan tai.
• Adding a wildcard symbol may retrieve word variants: nguoi sach hoc tap, nghien cuu mon hoc nganh khoa ((hoc xa) or (hoc ma)) hoi va toan tai*.