Perhaps you should try some spelling variations:
2.3.4 communication » 12.2.4 communication, 12.4.4 communication, 2.3 communication
communication case » communications case, communication based, communication phase
developpement de » developpement des, developpement durable
a developpement » au developpement, de developpement, le developpement
inflation tax » inflation rate, inflation _, inflation target
prices 2.3.4 » prices 2.3.1, prices 2.3.5, prices 2.3.6
tax prices » gas prices, car prices, tax practices
de afrique » de l'afrique, en afrique, l afrique
case a » case 1, case 2, case 3

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation tax prices 2.3.4 communication case a developpement de afrique.*.