Best books to understand chanakya’s philosophy (to be more precise, chanakya’s principles) were authored by shri. B.K.Chaturvedi and Shri. Radhakrishnan Pillai. Their efforts translated the arthasasthra in simple language.
Radhakrishnan Pillai authored dozens of books on the principles of chanakya, and submitted it for the benefit of people. Following are some of the masterpieces useful in understanding chanakya principles