Search issues with tags, author names

I have an issue with the search ..i’m able to search based on the category but i would like to have the search work on tags, author names too…

is there any way i can search by tags, author names ..if i enter tag, author names i should be able to get the results related to that search terms ..

please help ??

https://www.ads-software.com/plugins/ajax-search-lite/