Perhaps you should try some spelling variations:
bat thanh » ban thanh, bac thanh, dat thanh
thanh do » thanh de, thanh pho, thanh hoa
su sach » so sach
hieu va » lieu va, hieu qua
luc bat » suc bat, luc nhat, luat bat
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
dang xa » dang xay, lang xa, dang ha
vu sach » vu bach, vu khach
y dang » ky dang, 2 dang, _ dang
do cua » doi cua, co cua, de 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) OR (vu sach)) y dang xa hoi. ((hieu ve) OR (hieu va)) cac luc bat thanh do cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y dang xa hoi. ((hieu ve) or (hieu va)) cac luc bat thanh do cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y dang xa hoi. ((hieu ve) or (hieu va)) cac luc bat thanh do cua tre*.