Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
qua ca » qua cua, qua cai, quan cau
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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: su sach y nang x hoi. hieu ((qua ca) OR (qua cac)) xuc ((tuan anh) OR (van thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ((qua ca) OR (qua cac)) xuc ((tuan anh) or (van thanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ((qua ca) OR (qua cac)) xuc ((tuan anh) or (van thanh)) vi cua tre*.