Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » ban thanh, va tinh, le thanh
sach ky » sac ky, sach y, sach ty
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao
va co » vo co

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 ky nang cao hoi. hieu ((va cam) or (va co)) xuc ((va thanh) or (gia thanh)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang cao hoi. hieu ((va cam) OR (va co)) xuc ((va thanh) OR (gia thanh)) hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang cao hoi. hieu ((va cam) or (va co)) xuc ((va thanh) or (gia thanh)) hoi cua tre*.