First, read these:
http://googlewebmastercentral.blogspot.com/2008/09/dynamic-urls-vs-static-urls.html
http://moz.com/blog/dynamic-urls-vs-static-urls-the-best-practice-for-seo-is-still-clear
Looking at the contents of site:http://www.cru.do/ I see that the title and description google is displaying are all the same. For example, http://www.cru.do/issues/1/?gashi should show the unique version of the title and content but it doesn't, it looks the same as the others. Now that page is also the third down in the list of links so, it may be a matter of time, or Google has stopped indexing those links since they don't appear to be unique content. The site looks young, so it could be a matter of time.
I also don't see a sitemap.xml file reference, so if you haven't submitted one (one way is through google webmasters) then I would suggest you do that.
I personally, haven't had great luck with dynamic urls, so I can't offer much help in the url structure except to say look at another older site with the same type of url and see how google has indexed it.