First page of my site dose not appear in searches

Hi!

I have this site CREARE SITE | Web Design si Optimizare SEO and after 6 month still doesn't appear in search results with the main page. The first page of site is optimized for this keyword "creare site" with a 3.3% density. Currently site have PR 4 and from the beginning all text from site is unique.

I check if the site is indexed and for this action site:crearesiteweb.net, link:crearesiteweb.net and info:crearesiteweb.net the site appear in Google.

I notice when i type in Google some text from the index with quote the site appear with first page. When i tape the same text without quote the site doesn't appear anymore.

This site is custom made in PHP and in my Google webmaster tools i don't see any issue

I am a old webmaster with experience and i don't know what happen with this site. The site have a good structure, friendly links, perfect on-page optimization, very relevant information...i don't know what to do with this site. I ask for reconsideration and Google answer me that is no manual spam.

I ask those webmasters with experience help me in this issue. Thank you very much!