Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications cross » communication cross, communications costs, communication across
age developpement » de developpement, le developpement, au developpement
informal 34 » informal q4, informal 8.4, informal _
des afrique » en afrique, de l'afrique
der mobile » der mobilen, der mobil, does mobile
cross age » across age, across ages, cross case
34 der » 3.4 der, 24 der, 34 de

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

• Adding a wildcard symbol may retrieve word variants: technological _ informal 34 der mobile communications cross age developpement des afrique.*.