Get specific websites

Hey everyone, wondering how i can scrape up very specific sites?

Example: Lets say i want to scrape up construction companies, I scrape up on the keyword scraper: construction, builders, and when i harvest URL’s i get like 5000 url’s that have not much to do with construction.

I want them to me more specific, maybe with only the .com where i wont have to deal with all of that- and then i could export them to the email scraper premium to have emails scraped. 

Anyone have an official way to get through this?