If some particular pages are not being listed by Google, then it's most likely some access issue. Usually websites consider crawlers as just guests.
So, if you allow only members to access the content, then you will have to change the user group of the crawlers.
Only then crawlers can access the content. Also, if somehow this is being restricted by robots.txt file, then you will have to change it. Usually robots.txt file determines the access of the crawlers, for a website.