Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
law developpement » le developpement, au developpement, leur developpement
city integrating » society integrating, cities integrating, polity integrating
developpement en » developpement et, developpement des, developpement de
technology city » technology ecit, technology china, technology costs
integrating a » integrating _, integrating human
3.3 optical » 3.3 optimal, 3.3 political, 3.3 critical
a 3.3 » a 3.2, i 3.3

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

• Adding a wildcard symbol may retrieve word variants: technology city integrating a 3.3 optical communication model law developpement en afrique.*.