Perhaps you should try some spelling variations:
communication phase » communication case, communication based, communication paper
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
der developpement » de developpement, des developpements, leur developpement
developpement en » developpement et, developpement des, developpement de
inflation goods » inflation good, inflation gross, information goods
goods prices » goods services, gas prices
prices 4.1 » price 4.1, prices 2.1, prices 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 goods prices 4.1 communication phase der developpement en afrique.*.