Perhaps you should try some spelling variations:
u.s communications » 3.1 communications, les communications, nps communications
der developpements » des developpements, deux developpements, de developpement
information 1.5.2 » information 1.2, information 2
developpements en » developpement en, developpement et, developpements de
technologies 2 » technologies _, technologies 4
1.5.2 der » 3.5.2 der, 5.5.2 der, 1.5.4 der
der u.s » over u.s, year u.s

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 1.5.2 der u.s communications _ der developpements en afrique.*.