Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
dai hai » dai han, dai tai, dai thao
dai hoi » dai hoc, dai moi
sai ky » sac ky
luc va » duc va, tuc va, loc va
su sai » su tai, su hai, su dai

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

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