Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
vien cac » vien bach, vien dai, vien da
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
smo hoc » so hoc
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, o hai
mo hoc » mon hoc, co 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 ((((mo hoc) or (smo hoc))) or (co hai)). hieu vien cac xuc van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((mo hoc) OR (smo hoc))) OR (co hai)). hieu vien cac xuc van thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((mo hoc) or (smo hoc))) or (co hai)). hieu vien cac xuc van thanh tai cua tre*.