Perhaps you should try some spelling variations:
communication model » communication media
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
technology users » technology use, technology series, technology transfers
developpement en » developpement et, developpement des, developpement de
users inflation » users information, der inflation, does inflation
inflation goods » inflation good, inflation gross, information goods
a developpement » au developpement, de developpement, le developpement
goods prices » goods services, gas prices
prices 3.1 » prices 2.1, prices 3.2, prices 2.3.1
model a » model 1

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

• Adding a wildcard symbol may retrieve word variants: technology users inflation goods prices 3.1 communication model a developpement en afrique.*.