Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
technologies 2 » technologies _, technologies 4
2.4 developing » 12.4 developing, 2.2 developing, 5.4 developing
developing em » developing e, developing eq, developing amp
contents a » contents 1, contents _, contents i
em africa » 1 africa
a de » a die, a der, a des

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information contents a de communication cost 2.4 developing em africa.*.