Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ly » sach y, sach lo, sach ty
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, xuc ban
va chat » van chat, va phat, cao chat
va cham » va tham
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ly nang ((mai hoi) or (dai hoi)). hieu ((va cham) or (va chat)) xuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang ((mai hoi) OR (dai hoi)). hieu ((va cham) OR (va chat)) xuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang ((mai hoi) or (dai hoi)). hieu ((va cham) or (va chat)) xuc van hanh di cua tre*.