Only a few hundred hits with hrefer

I'm new to hrefer and xrumer. I'm trying to scrape some search terms. According to google it's over 600k hits. When I try to scrape I only get a few hundred results. I want to scrape tens of thousands of results. Do I need paid proxies to do that? Do I have to use additive words?

Yes, try to use additive words, it would help to get better results. Also use google clones