Perhaps you should try some spelling variations:
personal communication » interpersonal communication
developing state » developing states, developing stable, developing strategy
model personal » der personal, model regional
technologie a » technologie c, technologie 3, technologie 6
a information » 2 information, 1 information
information 2 » information 3
state africa » trade africa
2 model » 3.2 model, 4.2 model, 2.2 model

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

• Adding a wildcard symbol may retrieve word variants: technologie a information 2 model personal communication costs _ developing state africa.*.