Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nhanh » hoc nganh, hoc phan
chong hoc » chung hoc, chong doc, thong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
nhan dan » phan dau, nhan tai
gian dan » gian lang
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
hoi ca » hoi cua, hoi cac, hoi cau

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 hoc tap, nghien thu cong hoc nhanh chong hoc ma hoi ca ((nhan dan) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien thu cong hoc nhanh chong hoc ma hoi ca ((nhan dan) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien thu cong hoc nhanh chong hoc ma hoi ca ((nhan dan) or (gian dan))*.