Perhaps you should try some spelling variations:
cost developpement » cost development, et developpement, post development
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
developpement en » developpement et, developpement des, developpement de
technology gaps » technology gap
inflation state » inflation starts, inflation rate, simulation state
gaps inflation » has inflation, grade inflation, rapid inflation
costs cost » costs cross, costs case, costs cash
space 4.1 » space 2.1, space 4.3, space 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology gaps inflation state space 4.1 communication costs cost developpement en afrique.*.