Hi Kumar,
Sorry about the late response.
On the General Options -> Sources panel if you turn on the Search in terms option, then the plugin will search in related categories as well: http://i.imgur.com/gLgjfTs.png
If you need more specific matching you can either change the Keyword logic option to “AND” on the General Options -> Behavior panel (https://i.imgur.com/ltMECtD.png), or turn on the Show exact matches only option on the same panel: http://i.imgur.com/JgxfVbU.png
