Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
cham hoi » cham voi, cham h'roi, pham hoai
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang
cam lo » nam lo, cam ly, cam o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y tang) or (ky dang)) ma hoi. hieu ve ((cham hoi) or (cam lo)) ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y tang) OR (ky dang)) ma hoi. hieu ve ((cham hoi) OR (cam lo)) ban thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((y tang) or (ky dang)) ma hoi. hieu ve ((cham hoi) or (cam lo)) ban thanh hai cua tre*.