Perhaps you should try some spelling variations:
personen communication » personal communication, personal communications, prone communication
communication cross » communication costs
development center » development case
urban development » human development
relations 7.1 » relations 2.1, relations 3.1, relations 5.1
technology 3 » technology _, technology 1, technology 4
der personen » der personalen, per person, und personen
center three » century three, center threats, chapter three
3 relations » et relations, des relations
cross urban » across urban, crisis urban, cairo's urban

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

• Adding a wildcard symbol may retrieve word variants: technology 3 relations 7.1 der personen communication cross urban development center three.*.