India Post — Not delivered the item of addressee

I am speed post on 29th july 2016at binnaguri west bengal post office to kathmandu nepal parcel ems no ew[protected]in but shown till date online tracking consignments not delivered for status delivery attempt failed and unsuccedful delivery please tell me what problem of not delivered the addresse andwhy aren't return the item of my address till date now what position of the parcel and where