Perhaps you should try some spelling variations:
recommender systems » recommender system, recommendation systems
technologies based » technologies used, technology based, technologies a
based information » basic information, based innovation, land information
information 3 » information 2
3 development » 2 development
credit trend » credit three, credit trap
cost aware » qos aware, code aware, cost share
systems 3 » systems 1
3 cost » 3 costs, 2.3 cost, 3.3 cost

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technologies based information 3 cost aware recommender systems 3 development credit trend.*.