Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
trade developments » trade development, rate developments, price developments
technology social » technology series
social validation » social evaluation, scale validation, model validation
developments from » development from, developments after, developments _
validation roman » validation data, validation a, validation tools
does mobile » das mobile
costs trade » costly trade
roman does » roman des, roman der, roman das
from care » from case, from cape, from cash

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

• Adding a wildcard symbol may retrieve word variants: technology social validation roman does mobile communications costs trade developments from care.*.