Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lam » thanh lap, hanh lam, thanh nam
cua triet » cua viet, su triet, va triet
dang xay » dang van
su sach » so sach, vu sach
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
cac cac » cac cach, ca cac, cac bac
cac ban » cac dan, cac van, can ban
lam cua » nam cua, lam chat

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 ((lang xa) OR (((dang xay) OR (van xay)))) hoi. hieu va cac cac ban thanh lam cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((lang xa) or (((dang xay) OR (van xay)))) hoi. hieu va cac cac ban thanh lam cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (((dang xay) OR (van xay)))) hoi. hieu va cac cac ban thanh lam cua triet*.