Perhaps you should try some spelling variations:
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
developpement de » developpement des, developpement durable
inflation wages » inflation rates, inflation taxes, inflation targets
4 developpement » de developpement, le developpement, et developpement
technology 6 » technology _, technology 1, technology 3
6 inflation » _ inflation, 2 inflation, d inflation
wages trade » wages race, wharves trade, states trade
de afrique » de l'afrique, en afrique, l afrique
trade 3.1 » trade 3.2, trade 4.1, trade 2.1
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology 6 inflation wages trade 3.1 communication costs 4 developpement de afrique.*.