Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
technologien dis » technologien des, technologien als, technologien im
dis information » mis information, aids information, des informations
3.3 developing » 4 developing, 2 developing, 1 developing
cost 3.3 » cost 3.2, cost 2.3, cost 3.4
1 debt » 3 debt
4 debt » 3 debt, 4 debats

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technologien dis information ((1 debt) OR (4 debt)) de communication cost 3.3 developing _ areas.~".
• Adding a wildcard symbol may retrieve word variants: technologien dis information ((1 debt) OR (4 debt)) de communication cost 3.3 developing _ areas.*.