Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
about development » youth development, port development, post development
development lie » development life, development li, development lid
inflation das » inflation bias, inflation tax, inflation a
lie afrique » l afrique
cost about » out about, just about, best about
das case » das coase, das cafe, das close
case 5.2 » case 4.2, case 3.2, case 2

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation das case 5.2 communication cost about development lie afrique.*.