Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
luc ban » duc ban, cuc ban, luc bat
y dang » ky dang, 2 dang, _ dang
de cua » le cua, dieu cua
te cua » tue cua, le cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xa hoi. ((hieu ve) OR (hieu va)) cac luc ban thanh ((de cua) OR (te cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xa hoi. ((hieu ve) or (hieu va)) cac luc ban thanh ((de cua) OR (te cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xa hoi. ((hieu ve) or (hieu va)) cac luc ban thanh ((de cua) OR (te cua)) tre*.