Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
dai moi » doi moi, dai hoi
hai cua » thai cua, dai cua, hoi cua
dai hai » dai han, dai hoi, dai tai
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
su hai » su tai
hai ky » thai ky, hoi ky, hai ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: su hai ky nang ((dai moi) or (dai hai)). ((hieu ve) or (hieu va)) coc luc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky nang ((dai moi) OR (dai hai)). ((hieu ve) OR (hieu va)) coc luc va hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky nang ((dai moi) or (dai hai)). ((hieu ve) or (hieu va)) coc luc va hanh hai cua tre*.