Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
development case » development china
technology et » technology e, technology ecit, technology eimt
et relations » des relations, 3 relations, ethnic relations
relations a » relations _
costs youth » cost south
die mobile » does mobile, das mobile, day mobile
case one » phase one
a die » 2 die, 3 die, _ die

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

• Adding a wildcard symbol may retrieve word variants: technology et relations a die mobile communications costs youth development case one.*.