Are your website’s page names full of underscores? If so it’s time to replace them.
Google prefers dashes to underscores
Dashes keep life simple for people too. After all, it’s much easier to read something like freelance-copywriting-services than freelance_copywriting_services. Once you’ve renamed your files, don’t forget to do a 301 redirect. Otherwise you’ll break all your inbound links, lose valuable link ‘juice’ and drop page rank. There are loads of good 301 redirect tutorials online.