Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nang mai » nang ma, nang tai, lang mai
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang mai hoi. ((hieu va) or (hieu qua)) cam tuc ((ban thanh) or (gia thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang mai hoi. ((hieu va) OR (hieu qua)) cam tuc ((ban thanh) OR (gia thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang mai hoi. ((hieu va) or (hieu qua)) cam tuc ((ban thanh) or (gia thanh)) hai cua tre*.