Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
hanh hai » thanh hai, nhanh hai, hang hai
dai hoi » dai hoc, dai hai, dai moi
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 sac » su sach, su cac
su xac » pu xac, su cac
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 sac) OR (su xac)) ky nang dai hoi. hieu ve cac luc va hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky nang dai hoi. hieu ve cac luc va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su xac)) ky nang dai hoi. hieu ve cac luc va hanh hai cua tre*.