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Ok, like 1 year ago my site was doing good in google search engine. But I decided to change CMS and design of the site. Did some mistakes like, changed site links structure (when I notice it later I changed it back), then some of the pages were lost because I simply didn't need them on the new cms and there were no feature of keeping them. Site has a  lot of backlinks and was strong in rankings. It's been almost a year or maybe already a year and I can't get even to top100 for those keywords... But I was in (top10-20) Site is still getting links, ranking well on yahoo and baidu, but google, just won't let my main keywords to come back. I rank for some that doesn't make sense to me and I even wasn't working on them.