Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
cong phap » chong phap, cong phan, cong pham
phap toan » phap hoan, phap luan, phap phan
cach hoc » cach thuc, cach thoi, dich hoc
cac cong » cua cong
khoa hoc » hoa hoc
su cach » su sach, tu cach, su cac
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: su cach hoc tap, nghien cac cong phap toan khoa hoc xa hoi ((va nhan) or (va phan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach hoc tap, nghien cac cong phap toan khoa hoc xa hoi ((va nhan) OR (va phan)) van.
• Adding a wildcard symbol may retrieve word variants: su cach hoc tap, nghien cac cong phap toan khoa hoc xa hoi ((va nhan) or (va phan)) van*.