Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
hieu quang » thieu quang, hieu quan, hieu qua
cach thuc » anh thuc, cac thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
hieu va » lieu va, hieu qua
va cach » va cac
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 ((thieu nang) or (hieu quang)) xa hoi. hieu va cach thuc dan hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thieu nang) OR (hieu quang)) xa hoi. hieu va cach thuc dan hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((thieu nang) or (hieu quang)) xa hoi. hieu va cach thuc dan hanh tai cua tre*.