Step1:
To edit search query manipulate script part:

<script type="text/javascript">
doJSON("/_api/search/query?querytext='isdocument=true+fileextension:pptx'&rowlimit=50",renderSearchResults,renderFail);
</script>

change querytext="%YOUR SEACRH TERM%"

Step2:
Use a ScriptEditor Webpart to host the script

Last edited Jan 31, 2014 at 12:40 PM by NickiBorell, version 9