Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien aids » technologien als, technologien ad, technologien des
aids information » chandos information, series information
de communication » mobile communication, online communication
3.2 developing » 3.3 developing, 2.2 developing, 3 developing
information 2 » information 3
cost 3.2 » cost 2.4
debt de » debt do, debt debt, debt gdp
2 debt » 3 debt, 4 debt, 2.5 debt

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

• Adding a wildcard symbol may retrieve word variants: technologien aids information 2 debt de communication cost 3.2 developing _ areas.*.