Clash Royale CLAN TAG

wordpress search result and permalink

I have a page that search's posts from specific category. when the permalink is in post id format it works well, but when I change it to post name format it returns no result :

when the permalink format is post id :

search page url :localhost/wordpress/?pageid=12

localhost/wordpress/?pageid=12

result page url :localhost/wordpress/?s=123

localhost/wordpress/?s=123

it works well but When I use postname format :

search page url: localhost/wordpress/verifycertificates/?s=123


result page url : localhost/wordpress/verifycertificates/?s=123

localhost/wordpress/verifycertificates/?s=123

it loads the "404 page" and the result not found.

the problem is here :

result page url :localhost/wordpress/?s=123
result page url: localhost/wordpress/verifycertificates/?s=123


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