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