Make sure you have clear and simple navigation to the pages in question. The bots have to be able to find the pages by browsing HTML links, so links contained in Javascript menus and Flash may not get crawled and indexed. Also make sure that the pages in question are not blocked. If you have nofollow on the links or a nofollow meta tag on the page, or if you block a section of your site in robots.txt the pages may not be indexed.

Sometimes, it may just be a matter of waiting. Unless Google decides your content is important enough (total inbound links is a major factor in this), Googlebot may only crawl your pages a few times a week/month. More inbound links to your major pages can increase both the rate that Google crawls those pages and the rate at which Google adds additional pages to their index.

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The best way to learn anything, is to question everything.