Perhaps you should try some spelling variations:
recommender systems » recommender system, recommendation systems
technologies past » technologies part, technologies pt, technologies art
past information » plant information, cost information, ist information
information 3 » information 2
3 development » 2 development
credit trend » credit three, credit trap
costs aware » cost aware
systems 3 » systems 1
3 costs » 3 cost, 4 costs

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

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