Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
developpement en » developpement et, developpement des, developpement de
technology flow » technology low, technology from, technology food
inflation rates » inflation rate
flow inflation » low inflation, food inflation, log inflation
rates rates » rates notes
rates 6.2 » rates 4.2, rates 3.2, rates 5.2

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

• Adding a wildcard symbol may retrieve word variants: technology flow inflation rates rates 6.2 communication costs _ developpement en afrique.*.