@lkarun to customize the search you should provide a custom data provider see a sample in the demo you can ofcourse use dataServicePINames instead of issuing an http request.
also using keyup to do the search instead of ng2-completer will probably not work.
Im using following code to load data from webservice.
im still getting 'ERROR TypeError: Cannot read property 'search' of undefined' error. Please help. Thanks,