Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
human interactions » human interaction, human intervention
techniques human » techniques head, techniques a, techniques aims
interactions pt » interaction pt, interactions et, interactions part
development lid » development led, development li, development lie
lid afrique » l afrique
pt data » pet data, ct data, plot data
costs 2 » costs 20, costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: techniques human interactions pt data data communications costs 2 development lid afrique.*.