Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach chu » sach che, sach thu, sach thue
ban hanh » ban hang
ban danh » ban doanh, ban dan, van danh
cau tren » cu tren, dau tren, ca tren
chu bang » thu bang, chuc nang, chu quang
hieu va » hieu qua
ca cua » co cua
bang x » nang x, bang _, bang 2
du cau » cu cau, da cau, di cau
x hoi » xa hoi, o hoi, x ho

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: thu sach chu bang x hoi. ((hieu va) OR (lieu va)) ca cua ((ban danh) OR (ban hanh)) du cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach chu bang x hoi. ((hieu va) or (lieu va)) ca cua ((ban danh) OR (ban hanh)) du cau tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach chu bang x hoi. ((hieu va) or (lieu va)) ca cua ((ban danh) OR (ban hanh)) du cau tren*.