Perhaps you should try some spelling variations:
rural communications » oral communication, rural telecommunications, cultural communications
communications costs » communication costs, communications _
trade developpement » trade developement, trade development, de developpement
developpement de » developpement des, developpement durable
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
costs trade » costly trade
etc rural » etc moral

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

• Adding a wildcard symbol may retrieve word variants: typology de variation _ etc rural communications costs trade developpement de l'afrique.*.