Website crawler

Is there any GM script which can crawl the web pages and save them?
Such as google search results.

no.

Use a proper website crawler program. You can get the starting url by searching for what you want in google, clicking search and then copying the url from the address bar that comes up for the results page. On the results page, the url shown in the address bar has your search query in it and you just put that into a proper crawler program to start searching from.