Can code affect search results

I have a site that I am optimizing. I have done this before and usually by this stage the site comes up on the serps . However with this one, it does not appear anywhere for the keywords that I am optimizing it for. It has the keywords in the url as well as all the other primary tags. It even has a few bakclinks with keyword anchors. I am thinking could be the code? .....Can someone please give me some tips on what it could be. I will pm the url if someone else interested in helping me.


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