If(Service == 'Tenant Referencing', 'References ','Policies ') + 'processed : '+ lstInvoice[0].TR_Count__c

{!IF(service == 'Tenant' || service == 'Reference'),'If-True-Display-This','If-False-Display-This'}

Public Sting sample;
for(integer i =0; i< lstInvoice.size() ; i++)
  {

if(Service == 'Tenant Referencing')
   {
sample = 'Tenant Referencing'+" "+'processed : '+lstInvoice[0].TR_Count__c;
    }

if(Service ==  'References ')
   {
sample =  'References '+" "+'processed : '+lstInvoice[0].TR_Count__c;
    }

if(Service == 'Policies ')
   {
sample = 'Policies '+" "+'processed : '+lstInvoice[0].TR_Count__c;
    }
}