Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
va cam » va cham, va cao, va cai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky nang x hoi. hieu ((va cam) or (va cac)) luc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang x hoi. hieu ((va cam) OR (va cac)) luc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang x hoi. hieu ((va cam) or (va cac)) luc van hanh vi ((cua tre) or (cuu tre))*.