Perhaps you should try some spelling variations:
2.3.5 communication » 2.3 communication, 2.2.3 communication, 2.5 communication
communication case » communications case, communication based, communication phase
au developpement » du developpement, de developpement, le developpement
developpement de » developpement des, developpement durable
inflation und » inflation index, inflation _, inflation tax
technology 3 » technology _, technology 1, technology 4
prices 2.3.5 » prices 2.3.1, prices 2.3.4, prices 2.3.6
3 inflation » _ inflation, 2 inflation, 6 inflation
und prices » fund prices, land prices, bond prices
case au » case a, case all

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

• Adding a wildcard symbol may retrieve word variants: technology 3 inflation und prices 2.3.5 communication case au developpement de l'afrique.*.