Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
va chat » van chat, va phat, cao chat
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, xuc ban
va cham » va tham
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: te sach y 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: te sach y nang ((mai hoi) OR (dai hoi)). hieu ((va cham) OR (va chat)) xuc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y 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: te sach y nang ((mai hoi) or (dai hoi)). hieu ((va cham) OR (va chat)) xuc van hanh di cua tre*.