Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
co thuc » do thuc, co thua, mo thuc
hieu va » lieu va
sach tu » sach thu, cach tu, sach ty
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
tu dang » thu dang, tu dong, su dang
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 tu dang ((xay hoi) OR (tay hoi)). ((hieu va) or (hieu qua)) co thuc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu dang ((xay hoi) OR (tay hoi)). ((hieu va) OR (hieu qua)) co thuc va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu dang ((xay hoi) OR (tay hoi)). ((hieu va) or (hieu qua)) co thuc va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu dang ((xay hoi) OR (tay hoi)). ((hieu va) or (hieu qua)) co thuc va thanh vai cua tre*.