Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
developpement de » developpement des, developpement durable
technology best » technology based
best inflation » bei inflation, modest inflation, about inflation
de afrique » de l'afrique, en afrique, l afrique
rate file » case file, rate fee, rate firm
file 2.3 » file 2.7, file 23, file 2.4.3
a zu » a zur, a zum, a z
2 zu » 2 zur, 2 zum

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technology best inflation rate file 2.3 communication ((a zu) OR (2 zu)) developpement de afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology best inflation rate file 2.3 communication ((a zu) OR (2 zu)) developpement de afrique.*.