Perhaps you should try some spelling variations:
oral communication » personal communication
information costs » information contents, information centers, information content
technologien 4 » technologien _, technologien 1, technologien 5
4 information » 2 information, 1 information
developing e » developing _, developing a, developing east
costs wage » costs water, costs case
e africa » em africa, de africa, eu africa

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

• Adding a wildcard symbol may retrieve word variants: technologien 4 information costs wage oral communication costs _ developing e africa.*.