Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
technology road » technology role, technology roadmap, technology robot
2.2 developing » 3.2 developing, 3.3 developing, 2.2 development
contents a » contents 1, contents _, contents i
cost 2.2 » costs 2.2, cost 2.4, cost 3.2
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: technology road information contents a de communication cost 2.2 developing _ africa.*.