Perhaps you should try some spelling variations:
communication network » communication networks, communications network, communications networks
otras communication » optical communication, towards communication, actors communication
technologies b » technologies _, technologies 4, technologies 2
b informations » b information, 2 informations, 3 informations
envelopment 1 » development 1, development 14, development 11
1 otras » y otras, 3 otras, de otras
und 1 » und 19, und 13, und 18

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

• Adding a wildcard symbol may retrieve word variants: technologies b informations und 1 otras communication network data envelopment 1 africa.*.