Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va thanh » gia thanh, ban thanh, va tinh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
sach ly » sach y, sach lo, sach ty
hieu va » lieu va
loi roi » loi noi, lai roi, voi roi
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ly nang ((ma hoi) or (loi roi)). ((hieu va) OR (hieu qua)) cac nuoc va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((ma hoi) OR (loi roi)). ((hieu va) OR (hieu qua)) cac nuoc va thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ((ma hoi) or (loi roi)). ((hieu va) OR (hieu qua)) cac nuoc va thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((ma hoi) or (loi roi)). ((hieu va) OR (hieu qua)) cac nuoc va thanh hai cua tre*.