Perhaps you should try some spelling variations:
policy intervention » policy interventions
communication costa » communication costs, communications costs, communication cote
intervention der » interventions under, intervention data, intervention part
de communication » mobile communication, online communication
developpement de » developpement des, developpement durable
e developpement » de developpement, le developpement, et developpement
de afrique » de l'afrique, en afrique, l afrique
der trade » der trager, der traum, fur trade
trade de » trade die, rade de, trade date

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

• Adding a wildcard symbol may retrieve word variants: technology policy intervention der trade de communication costa e developpement de afrique.*.