Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((x hoi) OR (xa hoi)). hieu ve ((cam duc) OR (cao duc)) va hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((x hoi) OR (xa hoi)). hieu ve ((cam duc) or (cao duc)) va hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) OR (xa hoi)). hieu ve ((cam duc) or (cao duc)) va hanh vi cua te*.