Perhaps you should try some spelling variations:
personal communication » interpersonal communication
trade developpement » trade developement, trade development, de developpement
communication crop » communication cross, communication europe, communication across
typologien die » typologien der, typologie des, typologie der
die variation » de variation, does variation, der variation
des personal » des personals, der personal, das personal
des afrique » en afrique, de l'afrique
crop trade » crops trade, crop storage

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

• Adding a wildcard symbol may retrieve word variants: typologien die variation _ des personal communication crop trade developpement des afrique.*.