@Hulyo: did you look at the two links I posted?
We strongly encourage you to pay very close attention to the Quality Guidelines below, which outline some of the illicit practices that may lead to a site being removed entirely from the Google index or otherwise affected by an algorithmic or manual spam action. If a site has been affected by a spam action, it may no longer show up in results on Google.com or on any of Google's partner sites.
Abusive tactics that aim to inflate the number and nature of inbound links such as links buying, participating in link schemes (link farms, link spamming and excessive link manipulation) can lead to your site being delisted from the Bing index.
We have seen members here who think they can fool the search engines and get away with it, only to return a short while later, asking how they can recover from a penalty. It is much easier to avoid such a penalty in the first place.