Perhaps you should try some spelling variations:
13.1 communication » 1.1 communication, 3.1 communication, 3.2 communication
development level » development local, development center, development recent
technology price » technology rich, technology voice, technology service
inflation durch » isolation durch, innovation durch, inflation der
4 development » 2 development, 4 developing
durch case » durch care, durch achse, durch das
case 13.1 » case 3.1, case 14.1, case 13.3
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology price inflation durch case 13.1 communication costs 4 development level afrique.*.