Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
dai hoi » dai hoc, dai moi
dai hai » dai han, dai tai, dai thao
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 ve cac luc va hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((dai hoi) OR (dai hai)). hieu ve cac luc va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((dai hoi) OR (dai hai)). hieu ve cac luc va hanh hai cua tre*.