Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
goc nganh » hoc nganh, hoc nhanh, cac nganh
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
van phan » van phong, van thanh, luan phan
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
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 mot goc nganh khoa hoc xa hoi ((va nhan) or (van phan)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cua mot goc nganh khoa hoc xa hoi ((va nhan) OR (van phan)) tai.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cua mot goc nganh khoa hoc xa hoi ((va nhan) or (van phan)) tai*.