Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
va lao » van lao, va bao, va lap
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky nang x ho. hieu ((va lao) or (va dao)) luc ((va hanh) OR (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky nang x ho. hieu ((va lao) OR (va dao)) luc ((va hanh) OR (van hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky nang x ho. hieu ((va lao) or (va dao)) luc ((va hanh) OR (van hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu dan ky nang x ho. hieu ((va lao) or (va dao)) luc ((va hanh) OR (van hanh)) vai cua tre*.