Fetch as Google tool is not the same as the submit URL tool that I have mentioned.
In the pages that are not indexed yet, there might be some accessibility issues. In such a case, you will be able to see the URLs in Issues and Warnings report from Webmaster.
If your site is a WordPress site, you can install a plugin - BWP GXS. This plugin automatically sets the ping frequency for each section. It helps in getting the site indexed quickly.
Another solution is to share your site's URL on social media platforms or update the site with fresh information daily. Once, Google bots identifies a site as a static site, it will take sometime to increase crawl and indexing frequency. So, make sure that you keep updating content on the site for next few days on a regular basis.