Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
ngan khong » nganh khong, nhan khong, ngan hang
khong hoc » khung hoc, thong hoc, khong thuoc
cach hoc » cach thuc, cach thoi, dich hoc
huu toan » huu tuan, cuu toan, huy toan
toan chi » toan cao, tai chi, luan chi
chi ngan » thi ngan, chinh ngan, chi nhanh
te cach » ve cach, te sach, tu cach
va phan » van phan, va phat, va phap
hoc xa » hoc ma
va nha » va nho, ve nha

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te cach hoc tap, nghien huu toan chi ngan khong hoc xa hoi ((va nha) or (va phan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach hoc tap, nghien huu toan chi ngan khong hoc xa hoi ((va nha) OR (va phan)) van.
• Adding a wildcard symbol may retrieve word variants: te cach hoc tap, nghien huu toan chi ngan khong hoc xa hoi ((va nha) or (va phan)) van*.