Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

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