Perhaps you should try some spelling variations:
tuan thai » xuan thai, tuan khai, tuan tai
thai cua » than cua, tai cuc, tri cua
van tuan » van quan, van ban, anh tuan
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
co hai » co dai, co hoi, o hai
ve cac » va cac, vien cac
so hoc » co hoc, mo hoc, so hoa
o hoc » co hoc, mo hoc, y hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((((o hoc) or (so hoc))) or (co hai)). hieu ve cac xuc van tuan thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((o hoc) OR (so hoc))) OR (co hai)). hieu ve cac xuc van tuan thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((o hoc) or (so hoc))) or (co hai)). hieu ve cac xuc van tuan thai cua tre*.