It is not the search engine, from where you should try to delete your history. It is te browser which you are using from where you need to delete them. For example, if you are using Google Chrome, or Internet Explorer, Firefox etc, the option for deleting the history would vary in their settings.
In Google Chrome, you get a settings button right beside your address bar. There in the history tab, you get two options-
1. clear browsing data
2. Remove selected items
So once you check on the sites you want to remove and click on "remove" they will be removed.
But make sure you also delete temporary internet files, cookies and caches to delete them permanently.
But i don't think, Internet Explorer offers you to delete particular sites.