Perhaps you should try some spelling variations:
mining development » mine development, housing development
3.2 communication » 3 communication, 2.3 communication, de communication
technology usage » technology use, technology age, technology users
usage inflation » wage inflation, age inflation, usage information
development en » developpement en, development menu, development eco
costs mining » costs missing, costs timing, costs defining
rate space » state space, trace space, safe space
space 3.2 » space 2.1

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

• Adding a wildcard symbol may retrieve word variants: technology usage inflation rate space 3.2 communication costs mining development en afrique.*.