using checkbox text values to perform search in database

I am working on a project where the user is displayed a image with hotspots . Upon clicking one part he is displayed a dynamically generated checkbox for which the values are picked from database(hotspot are mapped to value displayed). The problem I am facing is that when the value is a single word (ex. swelling) the code works fine and fetches the possible diseases, but when there are words like (ex. joint pain or nausea with vomiting) i.e the ones which contain space between them (more than one word as a checkbox value) the code does not work Here is the code

 protected void Button2_Click(object sender, EventArgs e)
{
    if (TextBox2.Text != "")
    {
        connection.Open();
        symptons = String.Join(", ", CheckBoxList1.Items.Cast<ListItem>().Where(i => i.Selected).Select(i => i.Text).ToArray());
        Label1.Text = symptons;
        string qury = symptons.Replace(", ", "','");
        string cm = "select distinct dname from disease d inner join diseasesymptom ds on ds.did=d.did inner join symptom s on s.sid=ds.sid where s.sname in ('" + qury + "')" + "and days >" + TextBox2.Text + " and days<41 order by (days) desc;";

        if (symptons != "")
        {
            MySqlCommand cmd = new MySqlCommand(cm, connection);
            using (MySqlDataAdapter sda = new MySqlDataAdapter())
            {
                cmd.Connection = connection;
                sda.SelectCommand = cmd;
                sda.Fill(dt);
                GridView1.DataSource = dt;
                GridView1.DataBind();
            }
        }
        else
        {
            Label1.Text = "select at least one symptom";
        }
    }
    else
    {
        string script = "alert(\"We can't predict without all inputs :(\");";
        ScriptManager.RegisterStartupScript(this, GetType(), "ServerControlScript", script, true);
    }
} 

Any help is appreciated thanks and I need answers asap.. need to submit tomorrow.. thanks ps I think it has something to do with Join and Replace that I am performing , any workaround is appreciated..thanks again