Some Articles Are Not Indexing

Greetings to all. New user here. I have been having a serious problem for a few days now. Some articles from this technology blog are not being indexed by Google. It is on WordPress not on Omeka. I’ve even contacted the Google Webmaster Forum, but they’re not helping me. Can anyone tell me what could be the problem behind this? Any kind of help would be greatly appreciated. And one more thing, if I switch to Omeka, are I likely to get the same error?