Php programmer needed

I have the site with many images. All of them have keywords.
When we type in "birthday", the search results brings all images that have keyword "birthday".

I want to enable the option that if someone types in "birthdays", search results would still bring all images that have keyword "birthday"

So essentially I need any plural search to bring singular search results.
ie if typed in weddings, it brings wedding results

The site is build on this platform - cmsaccount.com

If the above requirement is not possible, then maybe autocorrect would work. So if anyone types weddings, it would correct it to wedding and search results would be ok

Many Thanks
Andy