Hello anonymous user-3391 ,
Please the following steps:
1.Go to the results.aspx as an administrator
http://webapp/sites/sitename/Pages/results.aspx
2.Click "Edit page" under the Settings menu
3.Select "Search Results" web part and "Edit Web Part"
4.On the Search Results Web Part Panel, click on "Change query" button
5.On the "Build Your Query" page, go to SETTINGS tag and select "Don't remove duplicates" option
Thanks,
Echo Du
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