Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
duration targeting » modulation targeting, inflation targeting, subnational targeting
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
a developpement » au developpement, de developpement, le developpement
developpement l » developpement il, developpement la, developpement de
technology can » technology change, technology 1, technology 2.2
targeting als » targeting lars, targeting a, targeting alpha
can duration » war duration, a duration, panel duration
l afrique » en afrique
als 3.1 » duals 3.1, goals 3.1, rels 3.1
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology can duration targeting als 3.1 communications costs a developpement l afrique.*.