Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ty anh » ly anh, thuy anh
ky anh » ky danh, ly anh
gia » giao

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky anh) OR (ty anh)) ma hoi. hieu ve ((cac tuc) OR (cac tac)) gia thanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky anh) OR (ty anh)) ma hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky anh) OR (ty anh)) ma hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hai cua tre*.