Perhaps you should try some spelling variations:
6.1.3 communication » 2.2.3 communication, 2.8.3 communication, 3.2.3 communication
developpement en » developpement et, developpement des, developpement de
technology gaps » technology gap
inflation rates » inflation rate
gaps inflation » has inflation, grade inflation, rapid inflation
rates spaces » places spaces, papers spaces, spaces spaces
spaces 6.1.3 » spaces 2.1.3, space 3.1.3, spaces 6.2.1

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

• Adding a wildcard symbol may retrieve word variants: technology gaps inflation rates spaces 6.1.3 communication costs _ developpement en afrique.*.