Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
global development » regional development, social development, rural development
technology scale » technology state, technology social, technology shaped
scale selection » stable selection, case selection, shape selection
costs global » costly global, post global, cottons global
selection a » selection _, selection bias, selection 3.2
der mobile » der mobilen, der mobil, does mobile
a der » _ der, 2 der, 3 der

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

• Adding a wildcard symbol may retrieve word variants: technology scale selection a der mobile communications costs global development _ earth.*.