Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
technology users » technology use, technology series, technology transfers
developpement en » developpement et, developpement des, developpement de
users inflation » users information, der inflation, does inflation
rate chile » trade chile, rate choice, state chile

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

• Adding a wildcard symbol may retrieve word variants: technology users inflation rate chile 3.1 communications costs _ developpement en afrique.*.