Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hang tai » hang va, dung tai
duc manh » suc manh, duc anh, duc minh
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc phan
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sai ky » sac ky
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) cam ((duc van) or (duc manh)) hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) cam ((duc van) OR (duc manh)) hang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) cam ((duc van) or (duc manh)) hang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) cam ((duc van) or (duc manh)) hang tai cua tre*.