Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van phan
thai cuu » thai cua, tai cuc, thi cuc
tu sach » thu sach, su sach, te sach
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
co hai » co dai, co hoi, o hai
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc

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 ky nang ((o hoc) OR (co hai)). hieu ve cac xuc ((van khanh) OR (van anh)) thai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoc) or (co hai)). hieu ve cac xuc ((van khanh) OR (van anh)) thai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoc) or (co hai)). hieu ve cac xuc ((van khanh) OR (van anh)) thai cuu tre*.