Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
mine developpement » mine development, de developpement, le developpement
3.2 communication » 3 communication, 2.3 communication, de communication
technology 2.1.3 » technology 2.1.1, technology 2.1.2, technology 2.2.3
developpement en » developpement et, developpement des, developpement de
2.1.3 inflation » 2.2.4 inflation, 2.3 inflation, 2.3.1 inflation
inflation das » inflation bias, inflation tax, inflation a
das case » das coase, das cafe, das close
case 3.2 » case 4.2, case 3.1, case 5.2

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

• Adding a wildcard symbol may retrieve word variants: technology 2.1.3 inflation das case 3.2 communication cost mine developpement en afrique.*.