Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang hai » hoang hai, hang tai, thanh hai
cao hoi » cau hoi, co hoi, cao hoc
va cham » va tham
va chat » van chat, va phat, cao chat
va hang » van hang, va nang, va lang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang cao hoi. lieu ((va cham) or (va chat)) xuc va hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang cao hoi. lieu ((va cham) OR (va chat)) xuc va hang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang cao hoi. lieu ((va cham) or (va chat)) xuc va hang hai cua tre*.