Perhaps you should try some spelling variations:
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va dinh » van dinh, va kinh, va tinh
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
va cao » va cac, va co, va 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 cam ky nang ((xa hoi) or (mai hoi)). hieu va cao duc va dinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cam ky nang ((xa hoi) OR (mai hoi)). hieu va cao duc va dinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((xa hoi) or (mai hoi)). hieu va cao duc va dinh van cua tre*.