Here is a great effort by some to encode much of our Sanskrit literature in Unicode.
I found this through bhomiyo.com – while searching for वेदसारशिवस्तोत्रम. I found the वेदसारशिवस्तोत्रम. on wiki but I also found this site where there were lot of sanskrit literature including Gita, Vedas, Ramayan, Upnishad and all you can think of.
Please surely visit the sanskrit site and send you appreciation to them for bringing our vedic literature so closure to us.
Best thing was to search occurrences of ‘मानव’ or ‘मन’ in Gita. Open up gita page
And then search in browser for words you like and you can find out what chapter contains those words in Gita.