Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
luc va » tuc va, loc va
vi cua » vai cua, di cua
cua te » cua tu

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 van) OR (hieu va)) chat ((luc va) or (duc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang xa hoi. ((hieu van) OR (hieu va)) chat ((luc va) OR (duc va)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky dang xa hoi. ((hieu van) OR (hieu va)) chat ((luc va) or (duc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang xa hoi. ((hieu van) OR (hieu va)) chat ((luc va) or (duc va)) danh vi cua te*.