Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
su sach » so sach, vu sach
ty lang » tay lang, ty hang, tu lang
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va coc » va cuoc, va cac, va hoc
vi cua » vai cua, di 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 ((ty lang) OR (ty xang)) xa hoi. hieu va coc luc ((va thanh) OR (ban thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) OR (ty xang)) xa hoi. hieu va coc luc ((va thanh) or (ban thanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) OR (ty xang)) xa hoi. hieu va coc luc ((va thanh) or (ban thanh)) vi cua tre*.