Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc da » hoc dan, hoc dai, hoc dat
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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: thuoc ((sach hoc) OR (mach hoc)) tap, nghien cuu mon hoc da khoa hoc xa hoi ca nhan dan~.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach hoc) or (mach hoc)) tap, nghien cuu mon hoc da khoa hoc xa hoi ca nhan dan*.