Perhaps you should try some spelling variations:
national development » international development, institutional development, social development
2.1 communication » 2.14 communication, 2.3 communication, 2.7 communication
costs national » cross national, across national, gross national
technology r » technology 1, technology 3, technology 4
r inflation » _ inflation, 2 inflation, 6 inflation
rate space » state space, trace space, safe space
1 afrique » l afrique, en afrique, 1 enrique

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

• Adding a wildcard symbol may retrieve word variants: technology r inflation rate space 2.1 communication costs national development 1 afrique.*.