Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, hanh trang
hoc nhanh » hoc nganh, hoc phan
thang hoc » thang nhoc, than hoc, thanh hoc
sach doi » sach hoi, sach moi, sach dao
van nhan » van phan, van thanh, danh nhan
so sach » so sanh, bo sach, co sach
doi tap » doi tac, doi dap, doi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va nhan » ca nhan, va phan, va nha
ma hoi » mai hoi, xa hoi, ma hoa

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 doi tap, nghien cuu mon hoc nhanh thang hoc ma hoi ((va nhan) OR (van nhan)) tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach doi tap, nghien cuu mon hoc nhanh thang hoc ma hoi ((va nhan) OR (van nhan)) tai*".