Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
truc va » thuc va, thuc vat, trung va
dang de » dang deo, dung de, dang do
cua tre » cua te, cuu tre, cua triet
te cao » te bao
loc va » hoc va, luc va
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cao ky nang x ho. ((hieu ve) OR (hieu van)) cac ((loc va) or (truc va)) dang de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cao ky nang x ho. ((hieu ve) OR (hieu van)) cac ((loc va) OR (truc va)) dang de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cao ky nang x ho. ((hieu ve) OR (hieu van)) cac ((loc va) or (truc va)) dang de cua tre".
• Adding a wildcard symbol may retrieve word variants: te cao ky nang x ho. ((hieu ve) OR (hieu van)) cac ((loc va) or (truc va)) dang de cua tre*.