การ JOIN 3 ตาราง โค๊ดเป็นยังไงอ่าครับของผมมัน Error

        Dim objConn As OleDbConnection
        Dim dtAdapter As OleDbDataAdapter
        Dim dt As New DataTable
        Dim strConnString As String
        strConnString = "provider=microsoft.jet.oledb.4.0;user id=admin;password=;data source = D:\DBproject\project.mdb"
        objConn = New OleDbConnection(strConnString)
        objConn.Open()

        Dim strSQL As String
        strSQL = "SELECT book.book_id, "
        strSQL = strSQL & "book.book_name, book.Send_no, send.Send_date, book.Sub_no, sub.Sub_date "
        strSQL = strSQL & "FROM book LEFT JOIN send ON book.Send_no = send.Send_no "
        strSQL = strSQL & "LEFT JOIN sub ON book.Sub_no = sub.Sub_no "
        If strKeyWord <> "" Then
            strSQL = strSQL & " WHERE send.Send_date Like '%" & strKeyWord & "%'"
            strSQL = strSQL & " OR sub.Sub_date Like '%" & strKeyWord & "%'"
            strSQL = strSQL & "ORDER BY book.book_id ASC;"
        Else
        End If
        dtAdapter = New OleDbDataAdapter(strSQL, objConn)
        dtAdapter.Fill(dt)
        dtAdapter = Nothing
        objConn.Close()
        objConn = Nothing
        Me.DataGridView1.DataSource = dt