Hi I have a question, after getting front page in google for certain keyword and stay a while on top my site has vanish from google i don't know where it is now is there any way to bring back my site to front page of google? I need your help guys
Patience is the key because Google always tend to churn things around and if for some reason your site is not on top it may comeback. The main reason for things like this is your website may not be getting related backlinks as well as some good content related to the keywords.
Let me guess: site is new, was on top for 2 weeks and then, vanishes from top spots. Sandbox my friend. Just work it some more and move on.
quality back links and uniques content defiantly helps you try to gain more and more back links from relevant sites
first see your position in google now, using some SERP checking tools. then build more backlinks to get back the rank.