How did you set up the plugin? Which post types and taxonomies did you set Relevanssi to index?
Hi Mikko, I got this plugin directly from his website.
Post types: post, page, recipe, and popup
Taxonomies: category, recipe-category, recipe-tag, recipe-cuisine
Which search filter plugin are you using, or is it something built in your theme. Your search results page URL doesn’t use the regular WordPress parameters (you have ?palavras-chave=natas vs the usual ?s=natas).
The only plugin that looks like any kind of “search” is the XML Sitemap Generator for Google.
I believe the search engine is the one from the theme. I’ve never worked on that.
What’s the name of your theme? If it’s something that is freely available I can take a look. If it’s a premium theme, you need to ask the theme support for more details how the theme is built. There’s something unusual there, and unless I know what the theme is doing with the search, I can’t help you.