If your book is not appearing in Google searches,  there may be something specific in Google's algorithm that is not picking up your book, maybe because of its title.

Since no one outside Google knows how the algorithm works, there isn't anything Leanpub can directly do.

However, if you follow some of our discoverability tips in the following article, that might help:

http://help.leanpub.com/author-help/how-to-improve-discoverability-of-your-book-online-using-leanpub