Perhaps you should try some spelling variations:
gian cua » gian xu, ban cua
thai cua » than cua, tai cuc, tri cua
van hinh » van chinh, van thinh, van minh
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
hieu ve » hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
hai ky » thai ky, hoi ky, hai ly
su hai » su tai

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

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