Perhaps you should try some spelling variations:
2.3.5 communication » 2.3 communication, 2.2.3 communication, 2.5 communication
communication phase » communication case, communication based, communication paper
leur developpement » le developpement, deux developpements, de developpement
developpement il » developpement de, developpement et, developpement du
inflation oil » inflation die, inflation i, inflation ii
prices 2.3.5 » prices 2.3.1, prices 2.3.4, prices 2.3.6
phase leur » phase der, phase four
il afrique » l afrique, en afrique

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation oil prices 2.3.5 communication phase leur developpement il afrique.*.