Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoa nhanh » hoc nhanh, hoa khanh, hoa nhan
hoa thanh » hoan thanh, ha thanh, hoc thanh
chong doc » chong dich, chon loc, hong duc
giang dan » gian dan, giang day, giang van
cach hoc » cach thuc, cach thoi, dich hoc
cac cong » cua cong
ha giang » bai giang, bac giang, ha tang
su cach » su sach, tu cach, su cac
doc xa » duoc xa, hoc xa, do xa
hoi ha » hoi va, hoi khoa, hoi nhap

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 ((hoa nhanh) or (hoa thanh)) chong doc xa hoi ha giang dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach hoc tap, nghien cac cong ((hoa nhanh) OR (hoa thanh)) chong doc xa hoi ha giang dan.
• Adding a wildcard symbol may retrieve word variants: su cach hoc tap, nghien cac cong ((hoa nhanh) or (hoa thanh)) chong doc xa hoi ha giang dan*.