Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
12.3 communication » 2.3 communication, 1.3 communication, 2.2.3 communication
information rate » information ratio, information related, information matter
use information » user information, house information, users information
technology use » technology 1, technology 2.2, technology 3
envelopment en » developpement en, development menu
rate rates » rates rates, dates rates, frame rates
rates 12.3 » states 12.3, rates 4.3
cost data » test data

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

• Adding a wildcard symbol may retrieve word variants: technology use information rate rates 12.3 communication cost data envelopment en afrique.*.