Using Google's search engine

I would be careful not to violate Google's terms of service. I would also try to obtain patent or CR protection for your software. You can then effectively approach Google from a position of strength whereby if they in fact want to use your software, they will have to pay you for it. Alternatively, you can cross-license each other - you get to make, use, and sell your software without violating Google's terms of service, and Google gets to use your software without infringing your patent or CR.

As Steven already pointed out, I would be careful not to violate Google's terms of service and protect your idea before approaching them. I assume that you have looked at the developers console https://console.developers.google.com for APIs that are available to incorporate in your software. This is usually the safest way to start incorporating Google technology in your own software solutions and comes with clear terms of what you may and may not do with it.