There are a few reasons for such thing to happen:
1. You didn't publish your site -
At the right corner of your site, please press the blue button (“publish”). Wait up to one hour and then check for search results.
2. Your site is hidden from search engines -
To allow Site Search+ to index your site, follow the following directions:
Please press Settings while in your site's dashboard,
And turn on "Allow search engines to include your site..."
Then per each page:
a. Open the Wix Editor
b.Go to the top left==> Page Manager ==> 3 dots (...) ==> Page SEO
c. Turn off "hide this page from search results"
d. Verify each page you would like to be visible in the search results is not marked as Hidden.
3. Your site is restricted or password protected - In cases of sites that have sections that require passwords (for example, “members only” page), Site Search + will not be able to sync your site.