Kibana search

I am using kibana4 for visualizing the elastic search results.
The problem what i am facing is that i have a search query (drive OR exchange), which is resulting the matching hits correctly, but i am not sure how would i make a filter for this search.
I can make individual filters though, but doing that the other keyword search will be vanished.

Could someone please help me in achieving the filter for the aggregated search.

Thanks in advance!

For OR condition you can try this in Kibana search pannel

extension:php OR extension:html

where extension is a field name

You'll be able to do this within a structured filter (not just the search bar, which you can do today) once this enhancement is introduced (currently targeted to Kibana 4.3):