Many times google give text adds in the search so to remove them i have a software for you.

It is actually an add-on for firefox .
You just need to download optimize google add-on for firefox.
After adding this add-on to your firefox you are done and let this software to do it's work . I have an example image for it








 
You can easily filter your search results to see dead websites by using wayback machine

Way back machine is actually a software which let your browser to surf internet as it was before any changing

In the end i would like suggest you to use google suggested sites which make searching on this powerfull search engine easy.