Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, doanh khoa, anh khoa
sach hoc » cach hoc, sach hoi, mach hoc
phat tan » pha tan, nhat tan, pham tan
tu sach » thu sach, su sach, te sach
ban hoc » bang hoc, van hoc, bai hoc
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 cua ban hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va phat tan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cua ban hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi va phat tan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cua ban hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va phat tan*.