how to search by any character in Chosen

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C#

ASP.NET

I have a drop down box in asp.net page.
here example

<link href="Scripts/chosen.css" rel="stylesheet" />
<script src="Scripts/chosen.jquery.js"></script>

       <script type="text/javascript">
           $(".chosen-select").chosen()
           search_contains = true;
           allow_single_deselect=true;
       </script>

dropdownbox code:

<asp:DropDownList ID="ddlNo" runat="server" CssClass="chosen-select" Width="100%" AutoPostBack="true" TabIndex="1" OnSelectedIndexChanged="ddlNo_SelectedIndexChanged">
</asp:DropDownList>

this search by only word. I need to search by any character. Please help me to solve this.