I need search content for only one site and not for all sites, How I can do this?
For example: in the advance search, in a specific site, I search all files MP3, but I get all files MP3 of the all repository and not of the site. I need make the same search for a one site.
You need to add filter on site and build lucene search query in format like PATH:"/app:company_home/st:sites/cm:{site_name}/*". And If you are using OOTB advance search then you may need to customize it.