Perhaps you should try some spelling variations:
recommender systems » recommender system, recommendation systems
technologies case » technologies based, technologies can, technologies create
case information » care information, based information, phase 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 case information 3 cost aware recommender systems 3 development credit trend.*.