Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
information unit » information units, information united, information und
developpement en » developpement et, developpement des, developpement de
a information » 2 information, 1 information
technology a » technology 1, technology 3, technology 4
unit trade » union trade, net trade, unique trade
trade 2.3 » trade 2.2, trade 2.1, trade 1.3

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

• Adding a wildcard symbol may retrieve word variants: technology a information unit trade 2.3 communication costs _ developpement en afrique.*.