Perhaps you should try some spelling variations:
gianh dan » gian dan, giang day, giang van
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
hoc pham » hoc phan, hoc phat, hoc phap
khoa hoc » hoa hoc
va gianh » va gian, van giang, va giai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (mach hoc)) tap, nghien cuu mon hoc pham khoa hoc ma hoi va gianh dan~.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (mach hoc)) tap, nghien cuu mon hoc pham khoa hoc ma hoi va gianh dan*.