Why Nepal is Not Getting back its Captured territory From India?when British has already returned From India?

Why Nepal is Not Getting back its Captured territory From India?when British has already returned From India?which was captured by british east indies.The territory is Not legally in Indian country Map. nor in Nepalese country map ? british captured nepalese land when nepal and british india has a war several times? when british people saw the courage of Nepalese people , Gorkha People, they wish to take them as their army, thats why Gorkha brigade has been established in British india , which is still giving the service to India. and britain too.its a history. India dont want to return back Neplas land because india thought it is powerful and can do anything to neighbour country. india want to capture every neighbour country like they captured Assam.It was written clearley in former prime minister jawaharalal Nehrus book that within 2000 AD nepal will be part of Indian terriotory.