Perhaps you should try some spelling variations:
leur developpement » le developpement, deux developpements, de developpement
developpement en » developpement et, developpement des, developpement de
4 communication » 3 communication, 5.4 communication, de communication
inflation tax » inflation rate, inflation _, inflation target
tax prices » gas prices, car prices, tax practices
costs leur » costs clear
prices 4 » prices _, prices a, prices 3

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation tax prices 4 communication costs leur developpement en afrique.*.