Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
lai hoi » dai hoi, lai hoa, lai roi
cham lo » cham o, cham soc, cham hoi
mai hoi » mai khoi, dai hoi, mai doi
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
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 ((mai hoi) or (lai hoi)). hieu van ((cham lo) or (cam lo)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ((mai hoi) OR (lai hoi)). hieu van ((cham lo) OR (cam lo)) va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ((mai hoi) or (lai hoi)). hieu van ((cham lo) or (cam lo)) va thanh vai cua tre*.