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
cham hoi » cham voi, cham h'roi, pham hoai
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 5 tang
7 tang » 6 tang
cam o » cham o, cam lo, ca o

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: thu sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((cham hoi) OR (cam o)) va thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((cham hoi) or (cam o)) va thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((cham hoi) or (cam o)) va thanh vai cua tre*.