Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh thai » nhanh thai, hinh thai, hanh tai
bach xuc » bach tuoc, bach xuan, bach hue
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
sach ky » sach y, sach ty, sach kem
nang co » nang cao, nang doc, nang noi
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky

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) OR (((sac ky) OR (sai ky)))) nang co hoc. hieu vien bach xuc van hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (((sac ky) OR (sai ky)))) nang co hoc. hieu vien bach xuc van hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (((sac ky) OR (sai ky)))) nang co hoc. hieu vien bach xuc van hanh thai cua tre*.