Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
nang dai » nang dau, nang tai, lang dai
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
su sai » su tai, su dai, su mai
luc va » duc va, loc va
su hai » su tai
ve cac » va cac, vien cac

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) or (su hai)) ky nang dai hoi. hieu ve cac ((luc va) OR (tuc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su hai)) ky nang dai hoi. hieu ve cac ((luc va) OR (tuc va)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) or (su hai)) ky nang dai hoi. hieu ve cac ((luc va) OR (tuc va)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su hai)) ky nang dai hoi. hieu ve cac ((luc va) OR (tuc va)) hanh hai cua tre*.