Find Duplicate Records Using Dynamic SOQL

/*
* Purpose: Check the Duplicate Records with custom Address Fields on Custom Object.   
* Created By: Veera k 
* Last Modified By: 
* Current Version:  v1.0 
* Revision Log:  
*              v1.1 - 
*              v1.0 -           
*/

public class AddressCheck{

    public Static List<CustomObject__c> Comparision(String street,String city,String region,String country,String postalCode) {
        
        String  queryString='Select ID,name,Street__c,City__c,Region__c,Country__c,Postal_Code__c from CustomObject__c ';
        
        List<CustomObject__c> duplicateAddress;
        List<String> myFilter = new List<String>();         
        //Check Street is Blank or Not  
        if(!String.isBlank(street))
            myFilter.add('Street__c LIKE \'%' + street + '%\' ');
        //Check City is Blank or Not
        if(!String.isBlank(city))
            myFilter.add('City__c LIKE \'%' + city + '%\' ');
        //Check Region is Blank or Not
        if(!String.isBlank(region))
            myFilter.add('Region__c LIKE \'%' + region + '%\' ');
        //Check Country is Blank or Not
        if(!String.isBlank(country))
            myFilter.add('Country__c LIKE \'%' + country + '%\' ');
        //Check Postal code is Blank or Not
        if(!String.isBlank(postalCode))
            myFilter.add('Postal_Code__c LIKE \'%' + postalCode + '%\' ');
        
        if(myFilter.size()>0){
            queryString += ' WHERE ' + myFilter[0];
            for (Integer i = 1; i < myFilter.size(); i++)
                queryString += 'AND ' + myFilter[i];
            
        }
        
        queryString += 'ORDER BY createdDate ASC';
        
        
        duplicateAddress = database.query(queryString );
        
        return duplicateAddress;
        
    }
}