Site Is Not Showing Up In Search Results On Google Etc

For some reason i am not showing up on search results for certain products that was on there prior to all the upgrades were done is there someone out there that can look into this for me and help me since i do not know code stuff . thank u

this can be not related to upgrades, google constantly changes their algorithms. I have felt a large drop of my indexed pages recently, probably they feel some of the pages are not so important with poor content..