Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac khoi » cac thoi, cac khoan, cach thoi
te sach » toc sach
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
sach ly » sach y, sach lo, sach ty
dai hoi » dai hoc, dai hai, dai moi
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly nang ((cac khoi) or (dai hoi)). hieu ((va cham) or (va phat)) duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((cac khoi) OR (dai hoi)). hieu ((va cham) OR (va phat)) duc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((cac khoi) or (dai hoi)). hieu ((va cham) or (va phat)) duc van hanh vi cua tre*.