Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, nganh khong, doanh khoa
khanh hoa » thanh hoa, hang hoa
sach hoi » sach doi, sach moi, cach thoi
cac cong » cua cong
cong coc » cong cuoc, cong cac, cong co
phat van » pham van, phan van, phap van
so sach » so sanh, bo sach, co sach
hoi tap » hoi dap, hoc tap, hoi tai
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: so sach hoi tap, nghien cac cong coc ((nganh khoa) or (khanh hoa)) hoc xa hoi va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoi tap, nghien cac cong coc ((nganh khoa) OR (khanh hoa)) hoc xa hoi va phat van.
• Adding a wildcard symbol may retrieve word variants: so sach hoi tap, nghien cac cong coc ((nganh khoa) or (khanh hoa)) hoc xa hoi va phat van*.