URL Syntax:
/apex/advpm__SearchResults?id=<Matter ID>&nm=<Matter Name>&stsr=<Search Text>&stob=advpm__Matter__c&srch_only=<Object Name List> 

URL Parameters:

• id
  Pass Matter ID merge variable. (id={!advpm__Matter__c.Id}) 
• nm
  Pass Matter Name variable. (nm={!advpm__Matter__c.Name}) 
• stsr
  Pass a Search Term string for search results. (stsr=search test string) 
• stob
  Always be passed as advpm__Matter__c. (stob=advpm__Matter__c) 
• srch_only
  Pass a list of Object API names seperated with a comma. (srch_only=Note,advpm__Participant__c,advpm__Time__c)

Example:

window.top.location = '/apex/advpm__SearchResults?id={!advpm__Matter__c.Id}&nm={!advpm__Matter__c.Name}&stsr=search text here&stob=advpm__Matter__c&srch_only=Note,advpm__Participant__c';