Perhaps you should try some spelling variations:
communication phase » communication case, communication based, communication paper
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
der developpement » de developpement, des developpements, leur developpement
developpement en » developpement et, developpement des, developpement de
inflation world » inflation gerold, innovation world, inflation build
world prices » food prices
prices 3.1 » prices 2.1, prices 3.2, prices 2.3.1

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation world prices 3.1 communication phase der developpement en afrique.*.