ASP+access搜索条输入多个关键词查询的问题

下面的代码，没法获取同一文本框多个用空格分格的关键词，为什么没起作用啊？谁能帮忙，谢谢！！

cxsj=request("cxsj")
cxsj=Rtrim(LTrim(cxsj))
bb=request("bb")
dd=request("dd")
SearchUC=request("SearchUC")
dim pageCount
page = cint(request("page"))

set conn=server.createobject("adodb.connection")
set rs=server.createobject("adodb.recordset")
conn.open "DBQ=" & server.mappath("SpiderResult1.mdb") & ";DefaultDir=;DRIVER={Microsoft Access Driver (*.mdb)};"

sql="select * from xodntad where 1=1 "

sql="select * from xodntad where feng like '%%' "

Dim SearchStr

if instr(cxsj,"+")<>0 then ’这里同一文本框获取多个空格分开的关键词，没法获取什么原因，那里错了。
str = split(cxsj,"+")
for i=0 to ubound(str)
sql = sql&" and minqing like'%"&str(i)&"%'"
next
end if

if bb<>"" then
sql=sql&"and dindi like '%"&bb&"%'"
end if

if dd<>"" then

sql=sql&"and xodntad like '%"&dd&"%'"

end if

if SearchUC="" then

sql=sql&"  order by id desc"

end if

if SearchUC="1" then
sql=sql&" and ping between 0.01 and 100.00 order by ping asc"
end if

rs.open sql,conn,1,1