Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
thuoc xa » thuoc ma, thuoc la, thuoc tai
thuoc va » thuc va, thuoc ma, thuong va
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
nhan va » nhan tai, nhan dan, nhan tao
hoi ca » hoi cua, hoi cac, hoi cau

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 mon hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi ca nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu mon hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi ca nhan va".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mon hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi ca nhan va*.