It's completely indexed:http://www.google.com/search?q=site%3Awww.systemfunda.com&oq=site%3Awww.systemfunda.com#q=site:www.systemfunda.com%2Fforum
Today your forum has 117 threads and Google returns 143 results. It's indexed, period. But just because Google indexes your site doesn't mean it will be returned in an open search. The search above looks only in your site
by adding the "site:" parameter. An open search looks at ALL sites and if Google doesn't deem your site relevant to the given search, it's omitted.
Given the limited size of your site, it's not surprising that Google skipped it. You've probably heard the phrase "content is king" in SEO circles. Google looks at a bazillion sites every day; it's not a given that just because your site contains the phrase "A passionate rum essence and toasty hazelnut undertones are incorporated in the 2012 Bordeaux from Butafucco Vineyards" that Google will include it in the SERPs for said phrase (unless of course the user limits all results to your site, as I did above).
For what it's worth, it took around 2 years (and thousands of threads) before my site consistently appeared on pages 1-3 for competitive keywords. If you want to post specific queries you expected to see in page results, please post the search URL. But otherwise it sounds like the simple answer is "create more content that users (and thus Google) deem most relevant".