Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » thanh va, thanh ve, nhanh vi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
sac ky » cac ky, sai ky
bo van » vo van, so van, do van
nang o » nang co, nang ho, nang ro
te sac » te sach, te cac, te san
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang o hoi. ((hieu ve) OR (hieu van)) bac bo van ((thanh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang o hoi. ((hieu ve) OR (hieu van)) bac bo van ((thanh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang o hoi. ((hieu ve) OR (hieu van)) bac bo van ((thanh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang o hoi. ((hieu ve) OR (hieu van)) bac bo van ((thanh vi) or (hanh vi)) cua tre*.