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
3.3 developing » 4 developing, 2 developing, 1 developing
contents a » contents 1, contents _, contents i
cost 3.3 » cost 3.2, cost 2.3, cost 3.4
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 3.3 developing _ africa.*.