Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
co sach » bo sach, cuon sach, hoc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tru » ca tru, cac tro, cac thu
tru van » truc van, tu van, tru va
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: co sach ly hang xa hoi. ((hieu ve) or (hieu va)) cac tru van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ly hang xa hoi. ((hieu ve) OR (hieu va)) cac tru van thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: co sach ly hang xa hoi. ((hieu ve) or (hieu va)) cac tru van thanh tai cua tre*.