Perhaps you should try some spelling variations:
danh hai » dang hai, lanh hai, manh hai
van hoi » van hoc, van hoe, van loi
hieu va » lieu va
cao duc » dao duc, cao suc, giao duc
va danh » va dinh, va dan, va hanh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((van hoi) or (van hoa)). ((hieu va) OR (hieu qua)) cao duc va danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((van hoi) OR (van hoa)). ((hieu va) OR (hieu qua)) cao duc va danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((van hoi) or (van hoa)). ((hieu va) OR (hieu qua)) cao duc va danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((van hoi) or (van hoa)). ((hieu va) OR (hieu qua)) cao duc va danh hai cua tre*.