Is it possible to get DOI from ISBN of a book?
DOI and ISBN are two different identification numbers and can not be translated into each other. A (digital) book need not have a DOI number, and e.g. a journal article that has a DOI need not have an ISBN number.

If you want to look up whether a book (or journal article, etc.) has a DOI, you can query it at http://www.crossref.org/guestquery