Perhaps you should try some spelling variations:
cuon sac » cuon sach, cuong cac, cuong sau
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

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