Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
truc va » thuc vat, trung va
hai cua » thai cua, dai cua, hoi cua
thuc va » thuc vat, thuc dan, thuc day
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang xa hoi. ((hieu ve) or (hieu van)) cam ((truc va) or (thuc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang xa hoi. ((hieu ve) OR (hieu van)) cam ((truc va) OR (thuc va)) hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang xa hoi. ((hieu ve) or (hieu van)) cam ((truc va) or (thuc va)) hanh hai cua tre*.