my piece of land is occupied illegally by others.

You should immediately speak with a local real property attorney to discuss your situation.  There may be an issue with adverse possession of your property.  A local real property attorney will know the time period necessary to claim adverse possession, and can give you advice as to how to proceed. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.