Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
giang dan » gian dan, giang day, giang van
chong hoc » chung hoc, chong doc, thong hoc
bac giang » bai giang
hoa nhanh » hoc nhanh, hoa khanh, hoa nhan
hoa thanh » hoan thanh, ha thanh, hoc thanh
cac cong » cua cong
sach hoi » sach doi, sach moi, cach thoi
hoi bac » hoi bai, hoi ba, hoi bat
su sach » so sach, vu 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: su sach hoi tap, nghien cac cong ((hoa nhanh) or (hoa thanh)) chong hoc xa hoi bac giang dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien cac cong ((hoa nhanh) OR (hoa thanh)) chong hoc xa hoi bac giang dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cac cong ((hoa nhanh) or (hoa thanh)) chong hoc xa hoi bac giang dan*.