Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
moral communication » oral communication, global communication, verbal communication
trade developpement » trade developement, trade development, de developpement
developpement de » developpement des, developpement durable
ideologie und » theologie und, okologie und
und variation » und variationen, 2 variation, 4 variation
costly trade » costs trade, country trade, costly than

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

• Adding a wildcard symbol may retrieve word variants: ideologie und variation _ der moral communication costly trade developpement de l'afrique.*.