Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thuoc sach
cham voi » cham hoi, pham voi, cham soc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
cam lo » nam lo, cam ly, cam o
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu ve ((cham voi) or (cam lo)) va ((thanh vai) or (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ma hoi. hieu ve ((cham voi) OR (cam lo)) va ((thanh vai) OR (thanh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ma hoi. hieu ve ((cham voi) or (cam lo)) va ((thanh vai) or (thanh van)) cua tre*.