Hello Vikas,
If you're a budget to a mid-range type of traveller, then you will easily be able to explore Vietnam in a budget starting from ₹50,000 to ₹60,000 per person including accommodation, flights, sightseeing, meals and local transport.
Otherwise, if you're planning for a comfortable and leisurely luxury trip, then the cost will be somewhere starting from ₹80,000 to ₹1,00,000 per person including 4 or 5-star accommodation, flights, private sightseeing and transfers and meals.
Depending on your budget, you can choose either way to travel to Vietnam as it is a beautiful destination to explore.
Also, you can check out these Vietnam tour packages along with the itineraries for a better planning experience.
https://www.tripoto.com/tour-packages/vietnam/vietnam-and-cambodia-156543334049https://www.tripoto.com/tour-packages/vietnam/central-vietnam-tour-5d-4n-156310842031
I hope you find this information useful.
Thanks.