Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
technology high » technology rights, technology how, technology help
inflation rates » inflation rate
envelopment lin » development lin, development li, development lid
rates rates » rates notes
lin afrique » en afrique, l afrique
rates 4.1 » rates 4.2, rates 4.5, 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 high inflation rates rates 4.1 communication cost data envelopment lin afrique.*.