Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
qua ca » qua cac, qua cua, qua cai
ca xuc » cam xuc, chat xuc
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 ky) OR (sac ky)) nang x hoi. hieu qua ca xuc ((tuan anh) OR (van thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang x hoi. hieu qua ca xuc ((tuan anh) or (van thanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang x hoi. hieu qua ca xuc ((tuan anh) or (van thanh)) vi cua tre*.