Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
information costs » information contents, information centers, information content
used information » user information, use information, based information
technology used » technology use, technology based, technology users
3 communication » 4 communication, de communication, data communication
2.4 developing » 12.4 developing, 2.2 developing, 5.4 developing
costs debate » arts debate, city debate, class debate
developing e » developing _, developing a, developing east
debate 3 » debate _, debate 4, debate a
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: technology used information costs debate 3 communication cost 2.4 developing e africa.*.