Help me to block hacker

some comes on my site and launches some weird requests like this one. I saw these requests through the google search console

How do I block them with ithemes security?

Other examples :

https://elitefitness.fr/search/Exemple+d+annonce+site+de+rencontre+%E2%8A%B3+%E2%9C%93+www.SOIR.SU+%E2%9C%93+%E2%A0%B8+%E2%A4%96+hommes+celibataires+serieux/feed/rss2/

https://elitefitness.fr/search/Rencontre+sex+44+%E2%96%B9+%E2%9D%A5+http%3A//SOIR.SU+%E2%9D%A5+%E2%A0%84+%E2%8B%86+super+rencontre+site+de+mes+messages/feed/rss2/

https://elitefitness.fr/search/Montre+connect%C3%A9+polar+%E2%9E%A9+%E2%9D%A3+http%3A//SOIR.SU+%E2%9D%A3+%E2%A0%92+%E2%A4%8F+rencontre+vielle+en+manque+de+sexe/feed/rss2/

The page I need help with: [log in to see the link]