Perhaps you should try some spelling variations:
communications network » communications networks, communication network, communication networks
cities development » city development, countries development, editions development
2 communications » 2 communication, 3 communications, 4 communications
technologies a » technologies _, technologies 4, technologies 2
formulacion de » formulation des, formacion de, formulation _
network cities » networked cities, network ties, network entities
a formulacion » la formulacion, a formulation, la formulation
de 2 » dem 2, des 2, der 2

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

• Adding a wildcard symbol may retrieve word variants: technologies a formulacion de 2 2 communications network cities development _ african.*.