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
mai khoi » mai khoa, tai khoa, cac khoi
vai cua » dai cua, hai cua, lai cua
cham lo » cham o, cham soc, cham hoi
mai hoi » dai hoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach 7 » sach y, sach 2
cam lo » nam lo, cam ly, cam o
7 tang » 6 tang

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 7 tang ((mai hoi) or (mai khoi)). hieu ve ((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 7 tang ((mai hoi) OR (mai khoi)). hieu ve ((cham lo) OR (cam lo)) va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach 7 tang ((mai hoi) or (mai khoi)). hieu ve ((cham lo) or (cam lo)) va thanh vai cua tre*.