Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
dai moi » doi moi, dai hoi
va hanh » van hanh, va thanh, va danh
dai hai » dai han, dai hoi, dai tai
hieu ve » hieu van
coc loc » coc luc, chon loc
loc va » hoc va, luc va
su dai » sau dai, si dai, su tai
dai ky » dan ky, dai ly, sai ky

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

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