Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
del developpement » de developpement, des developpements, le developpement
developpement en » developpement et, developpement des, developpement de
based inflation » cases inflation, based information, based innovation
inflation tax » inflation rate, inflation _, inflation target
tax sources » 3a sources, data sources, east sources
sources 2.3 » sources 2.2, sources 3.3, source 2.3

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

• Adding a wildcard symbol may retrieve word variants: technology based inflation tax sources 2.3 communication _ del developpement en afrique.*.