Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cac thu » cach thuc, cac thoi
thu ban » thu hang
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
co hoi » co hoc, co loi
v nang » va nang, van nang, voi nang
ve luu » ke luu, vi luu

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 ((v nang) OR (vu nang)) co hoi. lieu va cac thu ban thanh ((ve luu) OR (ke suu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) co hoi. lieu va cac thu ban thanh ((ve luu) or (ke suu)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) co hoi. lieu va cac thu ban thanh ((ve luu) or (ke suu)) tre*.