Perhaps you should try some spelling variations:
personal communication » interpersonal communication
africa development » african development, american development, physical development
development series » development services, development agencies, development strategies
communication 1 » communication _, communication a, communication 3
typologien de » typologien der, typologie des, typologie der
variation der » variation des, variation bei, variation _
de variation » der variation, die variation, does variation
den personal » der personal, de personal, des personal
der den » oder den, der de, der der

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

• Adding a wildcard symbol may retrieve word variants: typologien de variation der den personal communication 1 africa development series afrique.*.