Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien dis » technologien des, technologien als, technologien im
information rate » information ratio, information related, information matter
de communication » mobile communication, online communication
dis information » mis information, aids information, des informations
2.2 developing » 3.2 developing, 3.3 developing, 2.2 development
developing e » developing _, developing a, developing east
rate debt » private debt
cost 2.2 » costs 2.2, cost 2.4, cost 3.2
debt de » debt do, debt debt, debt gdp
e area » fe area, 1 area, 3 area

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

• Adding a wildcard symbol may retrieve word variants: technologien dis information rate debt de communication cost 2.2 developing e area.*.