Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
4.2 communications » 4.2 communication, 3.2 communication, 6.2 communication
developpement en » developpement et, developpement des, developpement de
vt information » ct information, get information, iot information
technology vt » technology vi, technology 1, technology 3
model rules » moral rules, model results, model rebels
rules 4.2 » rules 3.2, rules 4.3

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

• Adding a wildcard symbol may retrieve word variants: technology vt information model rules 4.2 communications costs _ developpement en afrique.*.