Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
day thanh » dao thanh, dat thanh, da thanh
thuc day » thuc dan, thuc vat
can thuc » dan thuc, van thuc, cay thuc
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang

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 ((tu nang) OR (tu nano)) xa hoi. ((hieu va) or (lieu va)) can thuc day thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) xa hoi. ((hieu va) OR (lieu va)) can thuc day thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nano)) xa hoi. ((hieu va) or (lieu va)) can thuc day thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nano)) xa hoi. ((hieu va) or (lieu va)) can thuc day thanh hai cua tre*.