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
do communication » do communications, de communication, ngo communication
4 developing » 3 developing
developing a » developing _
4.2 debt » 4.2 der, 4.2 deep, 2.5 debt
debt do » debt gdp, debt how
a areas » 1 areas, 2 areas, 4 areas
cost 4 » cost _, cost 2.4

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

• Adding a wildcard symbol may retrieve word variants: technologien aids information 4.2 debt do communication cost 4 developing a areas.*.