Hi Anderson,
Just because you can see pages with the site search command (site:) it doesn't mean that they'll be ranking.
This is very top level but indexing can be a 3 step process with discovery, caching and "ranking". It could just be that those particular pages have just been discovered and cached but have not yet been associated with any result value to rank yet.
Obviously, there a ton of other potential reasons why those particular pages are not ranking. Without knowing which pages you're referring to, it's impossible to diagnosis the problem properly.