Well the Mongols did invade India, just not under Genghis Khan. Like Mahmud of Ghazni, Mohammed Ghori and Alexander, they crossed the Hindukush into India. India was never invaded from the Himalayan route before 1948. read more
( hope u know the case of mongol failure in invading japan) 4. By the time mongol attacked india, there were several uprisinng against the mongol rule in the empire itself . Since the empire was too vast, it was a major distraction. 5. Mongols could not even send its 30% armies for invading india as the mongol empire was too large then. read more
Large numbers of tribes that took shelter in the Delhi Sultanate as a result of the Mongol invasions changed the balance of power in North India. The Khalji tribe usurped power from the older Delhi Sultans and began to rapidly project their power into other parts of India. At about this time the Mongol raids into India were also renewed (1300). read more
Beginning in the Mongol heartland north of China, it grew to encompass that ancient Middle Kingdom, along with Russia, parts of modern-day eastern Europe, Persia, Iraq, northern India, and Central Asia (what now constitute the Turkish republics of Kazakhstan, Uzbekistan, Turkmenistan, and other states in the region). read more