Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
luc van » luoc van, luu van, duc van
va tham » van tham, va thanh, va thuat
va cham » va chat
mai hoi » mai khoi, dai hoi, lai hoi
sai ky » sac ky
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu cai

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

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