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 hai » dai han, dai hoi, dai tai
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
su mai » su tai, su dai, tu 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 mai) or (su hai)) ky nang dai hai. 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 mai) OR (su hai)) ky nang dai hai. hieu ve cac ((luc va) OR (tuc va)) hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su mai) or (su hai)) ky nang dai hai. hieu ve cac ((luc va) or (tuc va)) hanh hai cua tre*.