Suggest keyword for high traffic?

I have a website that offering services for website development, website design, seo, smo, android application development, iphone application development and mobile application development. I need more traffic for mobile application development and android application development. Please suggest me what off page and on page strategy should I use in orfer to increase website business.

http://www.devtechnosys.com/services/mobile-app-development/

Keyword is one which is important to gain more traffic. You need to choose those keywords that's competition is in a lower position. Suggested keywords:
Mobile application software
apps of android
android mobile apps
android apps for mobile

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