Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
dang mat » dang vat, dang mau, dung mat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
hoc bao » hoc cao, hoc bai, hoc giao
dua ban » dia ban, cua ban, qua ban
hieu va » lieu va, hieu qua
mat hoi » mai hoi, sat hoi, mat troi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
hoc bo » hoc co

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 ky dang mat hoi. hieu va cam ((dua ban) or (((hoc bao) or (hoc bo)))) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang mat hoi. hieu va cam ((dua ban) OR (((hoc bao) OR (hoc bo)))) thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang mat hoi. hieu va cam ((dua ban) or (((hoc bao) or (hoc bo)))) thanh hai cua tre*.