Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
te sach » toc sach
hoi cua » hoi chuc
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
ky danh » ky dang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ky anh » ly anh, ty 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 (ky danh)) ma hoi. hieu ve ((cac tuc) OR (cac tac)) gia thanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky anh) OR (ky danh)) ma hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky anh) OR (ky danh)) ma hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hoi cua tre*.